Service shocking and extremely frustrating

The service that I have received from Telkom regarding my issue, has up to now been shocking!!! In mid-November2016 I cancelled a Telkom contract. I have proof of the cancellation form which was filled in and emailed through by a person working at the Telkom store! I also have the reference number. Since then up to now Telkom has been subtracting money from my account EVERY MONTH!! That now makes it about 19 months that they have been subracting about R250 per month. So up to this date Telkom now owes me R4750. I have since my first cancellation ( in November 2016) been in contact with Telkom several times. I have already sent my proof of cancellation through to 3 different people and every time they told me that the previous person did something wrong and every time I believed this person will now solve the mess. I have dealt with how many people at cancellations, but the 3 people that I sent through proof of cancellation were Tamerad, Babyien and Dezonique. I also have proof of all of those emails. I am at my wits end and am now going to cancell all my Telkom contracts and get legal help.