DEIDRE DREYER from the accounts department billing me after I have fulfilled my contract and arguing and threatning me

DEIDRE DREYER from Herotel has been harrasing me to pay for wifi which I do not have. I have completed my contract in June, she has been threatning me to pay for July as she falsy states I have received an invoice for July which clearly has not happened as I signed in May for depleting contract which has been done and approved. now she wants me not only to pay for Herotel fibre which I never got nor an invoice but for fees behind. I have sent all my proof of payments all my invoices and the email they confirmed has been deactivated. also not the first head bump a few months ago they billed me twice the same day I had to wait almost 2 weeks for them to repay me as they claimed they never received my money but it was confirmed the next day the money has reflected for them to give my money back. these people like to **** you