Incorrect Billing

Vodacom has once again stuffed up my billing!!!! It is now the second time that Vodacom has billed me out of bundle rates on the data that I have used. After loading 15GB of data bundles they charge me an ENORMOUS amount for data besides what I have paid for the bundles. After the first time that they stuffed up my billing I always double check that I am still within my bundle. It is completely unacceptable and I won't recommend this service provider to anyone. The stress they put on an individual is completely unnecessary. I now face a bill twice the amount of my monthly income when it shouldn't have happened AT ALL!