Incorrect billing

I app**** for a new mobile contract on the 16th of February 2018 and I received my device within 4 days. As per the contractual terms and wordings of the contract a customer can return their device within 7 working days to upgrade their device. I logged in a request to change devices and the request was approved.

The new device that I app**** for is R 500 on a monthly basis and then all of a sudden I get an invoice for R 7 000. There is a device obligation fee that I have to pay for. I contacted the call centre and they admitted that this was incorrect and my query will be resolved within 72 hours.

Seven days have passed and I have not received any response from the company. This is unfair and a debit order of R 7 000 will set me back and I will not be able to settle any of my debit orders and this will subsequently affect my credit scoring. The debit order date is fast approaching and I do not want to end up blacklisted because some company failed to do their debit order runs correctly.