Very very very angry cutomer

I have a contract with Mtn and unfortunately the only good service you get is when you taking out the contract and when they calling you to market their products but if you visit their branches you'll never get a good service at all.I had a problem with my Hauwei P30 lite and on the 2nd of May 2020 I went to MTN Newton Park in PE,I stood on the queue outside but I understand because its lockdown,one of their employees came and asked us one by one what our queries were and I told him that my phone didn't want to switch on,the screen is green and have a red and a blue blocks and he said to me they don't have a Hauwei technician in their store and if he books the phone with their head office it will take 3 or more months to get it back,he even said his own phone is with his head office for repairs since January so I must go to Vodacom,I asked him why do I need to go to Vodacom when I have a contract with MTN,he said they have a huawei technician there,I said I don't know where is Vodacom and he said he will give me the adress so I waited on the queue and eventually I went in and completed the register by the security guard inside and the same guy who was telling me about Vodacom assisted me,he wrote the adress for me to take the phone and I asked what else was I supposed to take with he said my proof of purchase and I told him I took the contract online so I don't have it so I asked him to print one but he said he cant because the contract was taken out online so I must take the invoice that I received with the phone,so I took the phone there and they checked it and they said they cant see anything wrong with the phone they thought its the software but its not and everything is still fine with the phone,my phone was still not working so I went back to Mtn yesterday 12/05/2020 and I was assisted by a lady Olwethu,I told her my story and she said she wont be able to take the phone because I took it somewhere else so I told her that but I was referred by her colleague and she asked me the name of the colleague and I didn't know and she said I should come back the next day to look for the person who assisted me the first time and I said NO,she said if I don't know the person who assisted me she will not know as well I told her the date I was there and that the guy was sitting on boot number 7 and she said they are 18 there so she wont know,she refused to take the phone saying she can see that the phone was opened and I said its because I took it to the place that Mtn referred me to but no matter how much I was explaining myself to this lady she refused and told me that even if she were to send it to her head office they will return it I said its fine send it but she refused until the other lady came I assume its the supervisor,they decided to take the phone but I was told it wont be under waranty because now that the phone was opened I have lost the waranty.The Olwethu girl took out the form and asked for my ID and completed the form and she didn't even write what I said on the form she just wrote the 'Phone is dead and she could see that it was opened and it wont be under warranty'. 1.The 1st consultant clearly didn't want to assist me hence he told me about 3 months and sent me somewhere else 2.How as customer was I suppose to know the name of the consultant was not wearing any name badge even the one that was helping me yesterday was not wearing it even the supervisor but I must know the name 3.Where did Olwethu get the information that she wrote on the form that she sent to their head office as it is wrong from my name but she had my ID with and I was sitting in front of her and why didn't she write what I told her was wrong with the phone 4.The supervisor also said I must take it to the other guy that she knows who repairs phones because I'm going to pay now because it wont be under warranty 5.One consultant said the repairs will take 3 or more months the other one month but they working in one store 6.Im still paying you for this phone and I have never skipped a month and your service is just ridiculous and as for Olwethu she needs to go for Customer service training so she can know how to treat customers right and fairly,this is not about her,we don't go to that store to fight with her so she must leave her fighting spirit at home and she must please wear a mask because she wasn't even wearing a mask.