Bad service

It was the worst mistake i made to join neotel. After a month of service I tried to cancel the contract, they told me I must pay +- R16000 as a cancellation fee. I phoned numerous times complaining about the cordless phone that is very soft and my clients can not hear me...all I got from them is they do not have stock of anything else. I got a package of 10GB data a month which is suppose to cut off as soon as the 10gb is done. BUT NO! apparently some months the limit can be exceeded without authorization (at extra cost) and some months it cuts off on time. I have phoned to complain about my account again on the 11th of Jan - call was logged and the complaints department would have phoned me back in 4 hours - HELLO....ITS 6 DAYS LATER. The service is ****, the product is ****....