Worst, most horrible and disappointing service ever!!!!!!!

Got a contract with Vodacome and we agreed that my debit date is the 28th of each month. The contract was activated on the 1st of June 2020. 28th June there was no debit order. I then received an email statement that my account will be debited on the 28 of July and the amount will be R641 (because they assume ill have the amount they want at their own time). I contacted the Vodacom to understand where the R641 comes from as my contract is for R351. The agent failed to explain and advised that she will escalate the matter and gave me the ref ***. She advised then I call back in a week which i did I until gave up no one is available to assist. Today am getting an sms stating that the amount is now R723.99. like how the hell???!!!!!. This is the worse service ever. I have have been struggling with Vodacom from the first time I decided to give them a chance. The last time I have to complain in order for them to assist with my caller ID. Am not sure if they are aware how we are affected by this pandemic and not in a position to play around with money . Clearly there is something wrong with who ever deals with their billing department. I am very disappointment, angry and defeated!!!!