No progress after six months

I sold a house in Mangaung in 2017. All the paper work was filed by the attorneys (electronically and in person). Still, every month Risima sends me an email demanding outstanding payment. I have explained the situation to their agent Glen Motladile. I even put him in contact with my lawyer. And still I get their demanding emails. Do they want to solve the issue or are the making money by not solving it?