Unauthorised deductions/ number- MTN

I have had an unauthorised debit order deduction for an additional number which i did not authorise. I have spoken to the call centre and have seen my nearest MTN store. However i have been told to go and get affodavit from the Police station and go and see a MTN direct store which is two hour travel out of my work day. Seeing that i did not authorise this deduction or this number as a consumer i should have the right to expect MTN to correct the mistake on there side.