MTN contract ended - unable to migrate to prepaid

My cellphone contract expired at the end of May 2020. I have been trying since 26 May 2020 to migrate my number to prepaid. Despite numerous calls to 135 (MTN contact centre) as well as emails and escalations to *** and ***, my query is yet to be resolved. I received adhoc emails from the customer support team saying that they tried to contact me. This is not correct as I never received calls (or missed calls notifications) on my mobile number.

I have call logs as evidence of my calls to MTN's 135 contact centre where I waited on line for more that 20 minutes for the retentions division to answer.

In the meantime, MTN have deducted amounts from my bank account at the end of May 2020 and June 2020.

I have been a loyal MTN customer since 2001 and find this type of customer service dispicable and disingenuous.

Please can someone from MTN make contact with me as I have all but given up on the contact centre and email correspondence.