Vodacom is committing *****

I have been with Vodacom for years and never had a problem with them... until now. I renewed my contract in January and I would switch to new contract beginning of Feb. I got 10GB free data for one month so I didn't use my data of 650MB data I will get on my contract every month. It showed it will expire end of March. So I get 2 months to use all my data and voice minutes. When March came I got again my voice minutes and data of 650MB. I then noticed that they don't use the data and the voice minutes that would expire end of March, they used the new data and voice minutes that would expire end of April, so by the end of March I used up my data that will expire end of April and didn't get to use the data that would have expired end of March! That is steeling! The same with my voice minutes. I have called the call centre and they have send me message that it was resolved. 2 days later I went into a Vodacom shop and they said I must wait until month end and see if it was resolved. It wasn't so I went to Vodacom shop again. They lodge a complaint on my behalf and it has been 2 weeks and I still don't have any answer and also no data! And I refuse to buy since they owe me data and voice minutes. I will not make them anymore richer than they already are! If I don't get this resolved I will go to another provider. Vodacom is not the only cellphone provider in SA! I took screen shots of everytime I went on to the Vodacom app to check my balances. I will gladly give them to anyone to see how Vodacom is committing *****.