Stop contacting me

I am having the worst experience with this company. They work with Telkom as their collections department! I missed a payment in February which was then paid in March but till today I keep getting messages from them about unpaid debt that does not exist! Telkom has informed me that they should not be contacting me but they still at it! If you are not careful you might end up paying more than you should as the message comes with a sense of urgency ! “ Final Notice of Demand:Mr/s Nomandela,avoid LEGAL ACTION, pay your Telkom acc Bal R3182.93 using https://pay.nudebt.co.za/ep/*** Tel ***”