Pathetic service Matrix

I had a matrix contract which expired after three years. I took out a new contract with matrix for another three years. I sent a letter requesting my old contract to be cancelled as per the advise of the consultant. This apparently takes 20 buisness days to cancel.30 days later and I did not hear anything from the accounts department. I attempted to contact them but as usual they are very busy to answer their phones. Now I received an account for two devices. I am expected to pay for a disabled device and the new device. I have previously complained about matrix. Their technical and sales teams seem to be on point but their accounts department seems to extremely ***********. Their incompetence puts their clients in a difficult spot having to pay for something that they did not budget for. Catch a wake up matrix