Debit order activation

earlier this year arround march and april, i requested markhams to do a debit order for me, i was told to fill in debit order form, and send it back i emailed the form three times 3 times, customer services lady told me that they received my form and she assured me its done and its activated, to my suprise by month end no deduction made to my account, i then emailed it again, and i was told via email that they didnt receive i then sent it again for the third time, and i was told that my account is in arrears therefore thery cant activate debit order to my account. Now they call every day in odd hours i hate this because every time they call my bill goes up, what kind of a services is this?? the reason i told them to do a debit order was simply because i dont have time to go shop any more, but they cant help me instead they increase my buill for the why???? i mean really why its ****ing me off now, and its really annoying, guys for the 100 times just activate my debit order, and deduct from my account, is that hard to do, or is it too much to ask??????