Vodacom worst cellphone provider EVER!!!

I have 4 cell contracts with Vodacom for many years now never skipped a payment. Two (2) of my contracts were top-ups if your data is finished its finished. My other contract was extremely high (+-R2500 pm) and I changed this one also to a top-up 2 months ago. My other contract is still open and I used it sparingly and last month I went over my 500gig for the first time. So Vodacom informed me that my data will be finished soon and that I can buy more. Which I did. For the last 4 months I have not received a statement at all from them. Last month my account doubled to R4400, I expected it should have been +-R1500. Now this month the account is again more than R3800. What is happening Vodacom??? I tried to phone them NO answer, they experiencing very high volume of calls. I wonder why??? I tried to log onto my account also no luck. My one contract still have not received new data for the month of March.