Contract phone

My name is Thato Monoto and I have been an MTN customer for over ten years. I took a contract with you in 2019 which I was happy about.Then I was due for an upgrade which I took this year in the month of February. I went to MTN jabulani.mall branch and I was helped by a lady named kgopotso and I upgraded to a Huawei Y90. The phone only worked for two days and then it started giving me network problems. It was not reading the SIM card. I came to the store on the 3rd day and the same lady kgopotso and she said it's nothing serious and it may be caused by loadshedding so she turned me back home. The problem persisted and I came the following week ..only then the phone was booked for repair. It went for repairs for about 3 weeks..when I came back to the store to fetch the phone, they gave me the phone however the issue was not fixed as we checked it in the store. It was booked again for the second time. The phone went for fixing again for about 2 months ...during this time I didn't receive any communication from the store during this time. I then decided to go to the store yesterday 30 May 2023. When I got there the consultants told me that the phone was not fixed because it was locked, meaning it had a password. But when they themselves checked, they confirmed that the phone was not locked, it didn't require any password or patten whatsoever. This has now been approximately four months without a phone but the money is debited every month. I am a student and I'm also working so this is really frustrating, having to borrow phones from family members just so I can write school tests. So the consultants told me that they will book the phone again for repairs. But due to the service I have been getting for the past four months I want to cancel the contract and I should not be charged and penalty fee because I don't have the phone with me , actually I have never had the phone with me ever since it was bought. Today I am from the store again and I was told that the area manager and store manager are both on vacation so I have to wait for them to come back so they can cancel the contract. So while all this is happening I don't have a phone but money is being debited every month. At this point I feel I am being taken advantage of especially by the staff at Jabulani branch especially the supervisor Ipeleng as she has never treated my situation with urgency even after I told her I am a student and a new mom.