Still no feedback Dissatisfaction with the service and loss of benefits

Im highly disappointed with the service I have got from mtn. I took a contract in February 2017 and since then I had non stop issues with the handset. I sent it in the first time and waited over a month and the handset was replaced by mtn. The new handset troubled and I had to drop it off again which I had to wait over another month and the handset was again replaced. Once again the handset troubled again and then I had to drop it off and have waited over a month with no feedback. I called the repair center and was told a special reference number was given and I will need to go instore and get a brand new handset equivalent to the same value. (this is great as I don't want another blackberry priv ever again) I went into the Mtn LA Lucia store and spoke to a very helpful gentleman. I was told that I can get the Huawei P20 lite as a replacement however I will lose out on my 50gigs data and 10000 mtn to mtn minutes and that I will only get 2gig data and 150minutes and I think sms's aswell. This is totally un acceptable as I have been put through alot of inconvenience and hassles of switching devices and losing my contents most of the time. My contract is currently up for renewal and also will end in January 2019. If this is the service I am getting then I might aswell consider changing service providers. I am happy to accept the p20 lite without me losing any of my benefits as this is no fault of mine. I trust this matter will be handled accordingly. I am currently paying for a device which I currently do not have.