Telkom harassing me with threatening legal sms's with my accounts up to date

I don't owe Telkom a cent but I'm getting texts threatening that my account is being handed over to attorneys.

My business was sold and the account was transferred to the new owner. As such I was assured I was not liable for any amounts outstanding.

My business mobile account was settled in full and then transferred to being billed to my personal bank account via debit order.

My personal home adsl and landline is and always has been a debit order which has never bounced.

Telkom, FIX THIS! After hours of back and forth and poor service delivery in achieving the above, I flat out refuse to be harrassed by threatening texts on top of it.