***** and theft

I was at Pep Stores Orange Farm Eyethu Mall, was assisted by a cashier to Deposit money for someone and Pay R450 for my dstv account, the cashier assisted me but short paid me with R200 on my dstv account, I then went back to the store and was assisted by the store manager who advises that it is not Pro's duty to check receipts and change there off. She took my number and advises that they would call me back if there is an extra amount on one of their tills. Kindly please assist me with getting my money back Pep Stores has a reputation of ripping people off their money.