MiX Telematics Africa - customer service is non-existing!

MixTelematics' customer service is poor; They are very quick to collect monthly debit orders but once you want to cancel your contract (already expired in this case) they still keep on deducting a monthly subscription. They dont respond to emails or call you back; last phone call took 30 minutes with no one answering - I was just transferred from one operator to the next. Will NEVER do business with them again and certainly not recommended to any prospective Client!