Refund. Asap

I cancelled my contract in October. I went to the shop an paid full amount but my account is still debited. I need my money to be reversed asap.my accihtb was not suppose to have been debited. I don't owe mtn. Anything. I'm going to take this to the lawyers if it's not done. This must be sort dout by today. Rudzani Mudzwiri..