No Answer at SP Call Centre - USSD not working etc

I have been trying to contact my SP - MTN for several weeks now.<br> <br> The USSD options are not working.<br> The call centre is no use after holding for anything between 5 to 20 minutes in some cases the phone is simply disconnected.<br> I have also had a cancellation query on a contract since the day of delivery - it has now been running for almost a year and still this query has not been resolved.<br> <br> All of the above incurring me costs unnecessarily.<br> <br> I would like to:<br> 1. Have my query that has been going on for about a year now resolved as soon as possible.<br> 2. Set billing limits on my contract<br> 3. Discuss my account and payment options<br> <br> However I have not been able to contact them.<br> <br> It seems that Service Providers feel they don't have to offer a service yet we bound by contracts will simply have to pay.<br> <br> This is absolutely unacceptable.<br> <br> I am literally at my wits end with MTN. Maybe the best for all would be if MTN agreed to cancel my contract with them at no further financial costs incurred to myself.<br>