Cancelled Line with no consent

My prepaid line was cancelled without notification. Telkom has both my mobile number and email but not once did I receive a notification that my landline will be cancelled. I forgot to pay my annual rental and usually receive a reminder seeing it's once a year but not this time around. I called Telkom last month to enquire why my line wasnt working and was informed that it was suspended. I went into the store to pay and was informed the line is not suspended but cancelled. I've had the line for a number of years and do not want a post paid for a number of reasons one being it costly. my question is, why was I not informed my line was going to be cancelled or was it deliberate on Telkom's side to get me to go on postpaid as they've continued their prepaid? I need my line back please. I rely on it for a number of things.