Vodacom destroying credit record of customers

Bad service as always along with rude kids from account department, my wife received two items from Vodacom and within 18 days we sent back a modem since it was not the way we wanted it. And we went to one of the Voda store to check on my wife account and when we get there we were told that we owe 345 which includes both items and we ask why as we were expecting to pay for one item, then the lady told us to call the account department. Today I called and one rude lady told me that the account now is on 500 plus some cents and she doesn't know how and she can't even help and hang the phone. So what kind of behavior is that? And now you guys my got to pay extra money for some of the things she doesn't owe.

At first we were told that on delivery will have to pay 350 by one of your consultants to the RAM guys and I told them that won't happen and they can keep their items, and guess what? Items were delivered without any money to be paid.

Vodacom sort out that ****, my wife can't have a bad credit record because of your bed service from your clever consultants.