Poor service from MTN on upgrade application

I had very bad expereience with MTN on my data contract upgrade, I have went to their Cresta MTN branch, wrote email to their customer service and called the number they provided without any luck. Very bad service! Below are some details:

1. I previously received an email about the 5% price increase from MTN and then I was charged more than 5% price increase.(The price before the increase was R299, on My 2022 May bill, I was charged with R355) I then sent an email to customer service and I received an email saying MTN will adjust the increase to 5%. In my June bill, I was then charged with R314.38. In the reply email, MTN mentioned that they will credit my account with the additional amount that they charged me in May bill (R355 - R314.38 = R40.62) and I have not yet seem this amount refunded to me. Please see the email ***. Please kindly assist with the refund credit.

2. My data contract (please see mobile number in the email subject) was due for upgrade on 18 June 2022. I then went to MTN Cresta branch to apply for an upgrade, I completed and signed all paper works. After a week, I have not heard anything from MTN cresta branch. I then visited the MTN cresta branch on 25 June 2022, I was then informed by the branch that my application was declined due to I didn't meet minimum MTN criteria (code: D004). I asked what criteria are these and the MTN cresta branch could not advise me and refer me to customer service. I then wrote an email to customer service to explain the situation and I received a reply from "Adrian Stellenberg" from MTN to advise me that I need to call *** for assistance. I then called *** and your consultant Nkululeko say I need to speak the upgrade matter to customer service as they could not assist as sales department. Reference number: ***. Please kindly assist with what minimum criteria is not met as per code D004 and what other info you need from me?

3. Due to (2), I then decided to upgrade via my MTN app, I completed all the steps and received an email from MTN saying my upgrade application via MTN app has been submitted for approval with reference number: ***9 on 23 Jun 2022. I again didn't hear anything from MTN. Please kindly assist and advise the status of the upgrade application.