Refund for unauthorized deduction of R250

Rain deducted money from my bank account even though i had requested they not deduct as I am canceling their service, after having unresolved network problems for close to a month. When sending an email most of the time no response, when there's one, they don't put their name, they're very *****, unprofessional, and don't care. The last email last week said we canceled your bank account, but we still deducted the money. For God's sake why charge me for October,yet service blocke? it was prepaid not contract you fools, I want my R250 back.