THEFT/ *******ION

I have changed payment method from cash to debit also the date from 25th to the 5th. On 1st March I paid a cash of R80 and a further R121.50 was debited off my acc on 5th March which was the new agreement/ 24 months contract as advised by their agent. On 5th April R343,51 was debited instead of R121.50 because apparently I have 2 Access decoders and some contract cancellation that I know NOTHING about. I NEED MY REFUND!!!