Perspex South Africa is a ***** and is acting *********

For several months now I have been harassed by Perspex' accounts/finance department for outstanding invoices. They are just trying their luck. I never did business with this company, nor have I bought products from them. All my emails / requests for further information on an invoice have been ignored My requests to stop this harassment have been ignored and I keep receiving emails about outstanding amounts, to the extend that I am receiving an email with no text, only a pdf attached. This company is a *****.