Urgent Contract Dispute. MTN not honouring the agreement

On the 31st March 2025 I upgrade my data plan contract and it was activated on the 1st of April 2025. They consultant who was handling my upgrade was langa Lukanji. He promised me upgrade of 100GB for R239.00 per month of which i agreed to it ( MTN should have voice recordings for this agreement). At first I queried a pro-rated date allocation, on several occasions i requested a written agreement confirming my voice agreement however MTN failed to sent. I waited until the 17 April 2025 where my full allocation cycle starts, but i was only provisioned with 70GB of Data. on same day i called MTN retentions and they assured me they will escalate the matter to correct add the missing 30GB. The consultant i spoke to was buyani and i was given a reference number ***. On 18th I called Mtn and i was advised that Retentions department will only open on Tuesday 22nd April 2025. I called on the 22nd and still my queries is still not resolved. I asked to speak to a supervisor Ryan Bok and still he did not reach out to me after i was promised that he will calle back. I have now send official complaint to Mtn customer service of which if they are not willing to resolve the matter i will take it up with ICASA and ultimately terminate my contract without penalties. I am utterly disappointed.