INCORRECT BILLING

March I requested a debited order to be reinstated, at the Carnival Mall store. Which was not done. I went to Eastgate store to enquire about an early upgrade which was granted to me and Took another new contract on top. I left the store with two new phones and both are Huawei MATE 40 Pro. the total amount I have to pay was R2900.00 to R3000.00 this all happened between the 17th & 18th, which I requested both of them to be capped at 0 usage once the allocated services are depleted. I called the call centre on the 19th of April around 16h30PM and spoke to Precious who promised me that both contracts are capped on 0usage. to my surprise when I went to pay my account this past weekend, I was told that I need to pay R3789.00 which is not correct.

Can someone call me and advise what the amount is about...? MTN please note that I won't be paying the extra amount added on top of the R3000.00 that I was advised off my contact number is ***