Cancellation of a contract

In November 2016 we cancelled our landline, adsl and cellphone contract with Telkom. The adsl and landline has been cancelled with immediate effect. However, since then we have been trying to cancel the cellphone contract (the 2 year contract period has already expired), but with no luck. Between my husband and myself we have sent cancellation forms almost on a monthly basis. The telkom shop in Tygervalley "escalated" the case several times but we had no response at all. After the last "escalation" last week, I received an sms with a ref number and a message that I will be contacted within 24 hours by Telkom. Nothing happened. I phoned the call centre this afternoon and Cindy could not trace the ref number. I need this cell phone to be cancelled and my money refunded since I have not been using this cell phone in the past year.