Mtn fail to provision and activate data on my new contract

I have upgraded my contract during black Friday on the 27th November 2023, I was given prorata data to cover the date until the 17 December a date which my data is normally loaded. On 17th December I noticed my data getting depleted. An indication that mtn did not load the data as per contract. I was suppose to get 80gb data which comprise of 20gb choice, 20gb anytime, 20gb night and 2pgb YouTube. I logged a complaint with mtn and was told my data will be loaded I should give it time. Nothing was provided otherwise I was told that data was loaded as per the contract and I depleted it. I made too many complainted with mtn, but I was treated like insane and unreasonable person. I refer them to my mtn app which indicate my data usage for period between 17th December to the date of my contract which is far less than the data mtn suppose to provide, I was told the app cannot be re**** to as it provide the wrong figures. I'm buying my own data whilst having contract with mtn. I receive no help from call centre and the branches of mtn.

I tried Facebook engagement but I'm told the same story.