Unsatisfied customer of vodacom

Vodacom - I've had issues with my vodacom contract. Does it make sense that my monthly payment for a combo deal (X2) Huawei p30 lite phones is R549 per month I skipped one month of payment and all of a sudden my account is in arrears for the amount of R5000!?

I have called the center customer service where I had a very rude consultant who didn't even give me a chance to explain anything. Nothing was done about that and yet the calls are recorded. I then went into the vodacom store personally they told me a consultant had migrated my contract to over double of what I need to pay. I kindly asked them to investigate the matter till today no one has contacted me with regards to this issue. I am lost for words.