Account received after account was cancelled in March

My Telkom account was cancelled in March 2018. I had to fight with Telkom for 4 months to get the correct final bill. Then finally the correct final bill is provided. The final bill was settled and the following month another bill arrives at my house. I contacted the accounts department and spoke to Sharne who works in the PE branch. Request to speak to her manager, Nosipho, fell on deaf ears as even the manager does not have the decency to speak to the client. I am then told that the system is offline and i should call back. My account is cancelled in March. Why up until today am i receiving a bill? Telkom sucks big time.