Poor customer service and inaccessibility to information pertaining billings

I recently got a contract with Vodacom for an Oppo A38 on the Red top up plan , I opted for an additional 30GB bonus data at Around R175 per month. The red deal comes with its own data and the additional plan is a data plan. So at the begining of this month I only received an SMS confirming the allocation of the main plan for data with none for the additional plan , what I am still not aware of is if the data allocation is recurring or not . So upon checking my data usage on the My Vodacom plan today I realised there is a discrepancy , I contacted Vodacom's official Messenger profile as the 135 line wasn't useful and there is no option to speak to the consultant. Upon contacting them ,I kindly asked the person to check my history on the system so I may at least understand what the discrepancy might be for as my data finished early , I went and doubled checked on my Vodacom app for my usage and it still did not make sense . Whoever was incharge of the response (this past 2 hours ) , just asked for a screenshot of my balances and said "it shows it has been allocated and used based on the screenshot you sent ) . I asked the person to check for me on their system so I may get an explanation of what might possibly be the case ,have I overused the data or it has indeed not been allocated. The person persisted to say their feedback still remain the same despite my request to ask them to do a system confirmation as that can best describe or explain to me better. At this point I feel like cancelling the contract as the people who are supposed to help us are just not being that helpful . This is poor customer service and honestly I can't pay for something I'm not satisfied about.