MTN continuing to bill after migrating my account to Smart Village

I originally signed up with MTN Supersonic for Fibre at my home. After contacting MTN to upgrade my account to Uncapped I was advised by MTN that I migrate my account to Smart Village which is a company MTN acquired for the purpose of selling fibre services to residential customers.

Following their suggestion my account was "migrated" from MTN over to Smart Village and I started paying Smart Village for my fibre services. However, MTN continued to bill me, have since handed over the account to collections agency and blacklisted me.

Nobody seems interested in assisting me or dealing with this matter and I am unable to get this matter escalated outside of the contact centre.