Breach of contract by MTN and no assistance to customer despite 3 calls to call center

The utter lack of customer service from MTN is shocking. I upgraded my contract on the 4th June 2020 to the MYMTN 10GB Promo which is 70GB anytime (10+60Gb) and 70Gb night(10+60GB). I then received my data allocation on the 6th June 2020 as follows anytime data(10+60GB) all in order but the night data I only received 10Gb night and not the additional 60Gb night as per the contract. I then called the call center on the 6th June and was given a ref number and told it would take 48 to 72 hrs for them to assist. I then called again on the 10th June and was given another ref number for an escalation and was promised i would be assisted on the same day. Today is the 15th June and still no ref number. I called in this morning and was given the 3rd ref number for the escalation. Lets see what happens. I'm not holding my breath. If this does not get sorted out then I will be cancelling the contract as MTN is in breach of contract.