Not happy about unauthorized deduction from my bank account

My personal contract moved to a business contract through my work. First the migration happened and I couldn’t receive any calls.. stood at mTn tygervalley for aver an hour so they could sort it out. Now I see over R6000 was deducted from my bank account. I have been on old for 45min with your ca center... been transferred 5 times and still no one can help me. I am Not happy at all and expect my money to be refunded within 24 hours