3 months ongoing problem with zero help

My business has multiple lines with Vodacom, and have had endless problems for nearly 9 years, it has now hit a peak whereby I cannot even receive calls on my main business line. This query has now been going on for 3 months, I pay for a service I am not getting and have spent hours on the phone getting through to your call center, being issued a ticket number and my query has still not been resolved. I am now paying for one of your top contracts and have a phone that is useless to me. Vodacom is very happy to take premiums every month but cannot provide a service which you yourselves had been bound to in the contract that was signed, I pay my monthly contract yet I cannot receive a simple call. After numerous ticket numbers, all being closed before you have had the decency to correct, I still sit with a useless phone and high contract fees. Everytime you call, you are put through to a new person and no one gets back to you, its absolutely ridiculous, I am sick and tired of wasting my time calling and 3 months down the line, while Vodacom has happily still been deducting from my account, I don’t have a working phone, this is blatant breach of contract. Please sort this out immediately and do not send me a generic message saying that you will get back to me.