Beyond horrible service @ Telematics

Horrible Service @Telematics, I have been logging calls with them and they promise to come back to me but they never do. My contract expired in April and it was now on a month to month basis, they called me in October and I canceled with them but they keep debiting even when I have proof and now they have handed my account over. Can I please have the complaints procedure for this company coz they don't take clients serious. Today again Ennie Nyoni called from collections telling me account is in arrears, in Jan after logging numerous complaints Portia called me telling me that they got the recordings and they are gonna cancel the account. I just spoke with Randi Mazibuko telling me that's not what they see on their system as it sill shows im owing. How can I be owing when I have long canceled this and Portia who works for your company has also confirmed this told me they gonna write of this account.