Struggle to cancel landline

I already filled in my cancellation form 3 times (once physically at a branch) and called customer care 2 times. I get silly replies like that it sometimes takes a month to cancel the services. My debit order has gone off my Absa bank account for 3 months that I did not stay at my previous address anymore and I therefore stopped my debit order. I have an impeccable credit record and I fear that Telkom's useless administrative services will put this in jeopardy. I will never get a landline from them again - it is easy to see why no-one gets private telephone lines these days.