Dstv is a ****

Dstv is a ****, my mother is on compact. Last monthly she added the R99 internet deal 50GB advertised on TV. Decoder was delivered, 2 weeks later the 50GB was depleted. We called in to our surprise they signed her up for 25 GB anytime internet. Come month end she's billed this huge amount, mind you she had R240 credit which she paid more on the previous months. She paid R440 on top of the R240 she had but Dstv blocked her account claiming she owes them R560. Dstv is *****