Terrible service by the incompetence of your staff

In September I was contacted by the consultant from these company and told me about an account from capitec which i settled in August with capitec. I explained to her that i have the proof of payment where should i send, she gave me an e-mail adress and we also chat on whatsap on the company's account i send the proof of payment. The respond was only on whatsapp that the p.o.p was noted. Since that day i never got a call from them thought everything was sorted. To my suprice the sheriff was send to my home .... if that is the case which steps should i take because i have been getting threats because of their incompetence?