Bad service

MTN is one company that does not keep their promises. My contract is due for cancellation on both my lines. I called retentions in July to request for a cancellation and the consultant offered me a 30 days 2gb of data on each line for 3 months while on zero rated. She confirmed that data will be allocated on the 12th of August 2021. I never received any data. I called customer care at the beginning of September and I was informed that data was provisioned to both my numbers, in conclusion to this she advised me that she has logged a case as I explained to her that I'm quite certain that there is no data I received on any of my lines for the month of August. Immediately after dropping a call I received a message stating that my case has been closed. I called again the next day to be migrated to prepaid as there's no any benefit for me, to my surprise the retention consultant was to quick to offer me promotional packages instead of dealing with the issue at hand. I turned down all her offers as it is clear that MTN does not care about their customers. My worst nightmare was when she informed me that I will lose all my prepaid airtime and data should I want to continue with the migration. I'm now stuck with this useless zero rated contract. I'm very disappointed with MTN the service is terrible.