Dont trust Vodacom, they will bill you incorrectly!

I have been a loyal customer with Vodacom for the past 5 years and never had any issue with the service they provided. Due to the trusted customer relationship with the brand I took out a fiber line with Vodacom regardless of the high monthly premium they were charging (when compared to other fiber service providers) I still went with Vodacom as I trusted the brand. Two months ago I did a relocation, It took longer than expected to get the fiber working at my new home . I was daily on the call with call centre agents to get the problem fixed. Still I stayed a loyal customer to Vodacom. Today I got my invoice and my bill was R1600 more than expected. I called into the call centre and the agent advised that my account has been billed incorrectly and it will take up two 14 days for the amount to be adjusted . By then this amount will already be debited from my *** is alot of money as I did not budget for this . I dont understand how a company like Vodacom needs 14 days to fix a mistake they made which has a financial impact on their customer . The agent rudely told me that this is the process they have in place, where was the process when they billed me incorrectly. Vodacom is suppose to be an innovative brand providing the best service to their customer but instead they allowing their mistake to have a financial impact on their customer.