Handed over for a third time because MTN is not collecting funds

We are entering our 5th month trying to solve a seemingly simple problem. I am DESPERATE for someone to please solve my account problems. After MTN stopped debiting me, they have handed my over twice, I have been listed as a slow payer and still they are not collecting the funds from my account.

I am trying to pre-empt from being handed over and being listed as a slow payer for a third time in 5 months by placing this comment on here, as no-one is offering any real support through any other channel.

I need the following:

a) MTN to collect my monthly bill from my account via debit order b) Retract from being handed over, as I am being hounded by debt collectors c) Provide me with a letter stating that they are at fault here, as I need to rectify my credit score as a result of their poor service

PLEASE can someone from MTN actually resolve this once and for all. What else am I supposed to be doing here?