Disappointing service

Evaton Mall game has disappointed me as a customer after buying a lot of things from the store. We bought 3 phones in December one was A10 and the other was a J4. When the phones were purchased we were advised that the warranty of the phones is 12 months and the store will fix any problem with them withing the warranty period, when the proof is produced. On the 18th of March2020 we took the phone to game store in Evaton Mall because of the charging problem. We were then advised that we will get the sms once the phone is fixed to come and collect it. On the 14th of May I got a call from the supplier to say the J4 phone is owing R1700 for them to fix it. Then asked how is that possible because we were told at the store the phone will be fixed for free as the warranty period had not expired. I then explained to the person the phone is A10 not J4, the person called told me thet the phone they have is J4 and owes R1700 not A10 and spoke in a rude manner as if I was lying when I mentioned the phone is A10 not J4. Then they asked for the serian number of the phone, which was given to her, after she said the could pick up the phone is A10 not J4 after explaining to her without even apologising for the mistake from their side. We then went to the store the next day to understand what was happening then the person I spoke to at the customer service called someone to tell her that I am in store, I spoke to the lady over the phone who was shouting and told me that she called yesterday to tell us that the phone is owing R1700 and if we can't make that payment they will send us an sms to collect that phone. So my question is we were firstly told about the J4 that had a screen problem that would cost R1700, after picking up that the A10 was there not a J4, we are still being told about The same R1700 needs to be paid. The A10 was working perfectly except for the charging problem, we are told the phone is broken internally and connot be fixed. When the phones were purchased we were never told that if anything heppens the store will not fix it and when we took it to them in March, we were only advised the phone will be fixed and will be smsed when it's sorted out but the story was changed from J4 with the screen problem to the A10 that is internally broken. We no longer want the phone as we were told different stories about the phone instead we would like Game Evaton Mall to pay back the money we bought the phone with and keep the phone as the store has failed us after being the loyal customers to the store