Please Help

I have been trying to cancel my debit order since last year November. I have changed banks due to personal reasons and would prefer to pay myself which i have every month. They insist on putting the debit order through on the bank account even though I pay them the agreed amount every month. The debit order they put through last month rejected for obvious reasons as I do not use the account any more.Now they cut use of the phone until I pay theR62 because of the rejected debit order. I have already paid the amount due and cannot see why I should pay the R62. My son uses the phone for work and is thus phoneless. He has a small son and should anything go wrong with my grandson he can not be reached.I have spoken to 2 ladies tonight and could not make out their names. But as their recording says they do record the calls.so this should be easy to confirm. When I originaly cancelled the debit order I was informed that it could ne done telephonicaly and I confirmed telephonicaly that I want to cancel.I was informed that it is cancelled. Now they say not it was not cancelled. I am very unhappy as the staff do not seem to know their own procedures.