Telkom refuses to cancel our cellphone contract

We took a business combo in 2013 that came with a landline, cellphone and data and in May 2015 we requested Telkom to cancel and convert the cellphone to pre-paid as it has already expired. We emailed the cancellation form several times to both cancellation and escalation departments, we've called 10210 and we even visited the Telkom store at the Mall of North couple of days but the cellphone is not yet cancelled to date and they are still billing us for it. Here are the case numbers: ***7, ***3, ***5, ***6, ***2 &amp; AI number ***. <br> <br> We decided to stop paying the account to trigger the sense of urgency and big brother Telkom then decided to suspend our telephone line. They now sent us letters of demand, threating us with the credit bureau listing whilst they continue to ignore our requests to cancel the cellphone. <br> <br> Please Telkom, what more must we do for you to cancel the contract that expired a year ago and connect our landline back? We don't refuse to pay but we refuse to pay for services that we no longer need.<br>