RL Daly attorneys harrasing me

I'm so sick of this company, they are harrising me, calling me 20 times a day every day,on top of that I receive emails, I even got to a point where I made it clear that I don't want them to call, rather email me, they still continue. You pay them on time, they tell you they don't receive you payments, you send proof of payments still they can't find the payment. I went to a point where I asked FNB what on earth is going on with their lawyers and payments. FNB ractify receiving payments. I'm really angry with these people. You speak to their consultants and explain cut the call, another one calls you again with the same issue you have sorted out with the previous consultant.

I really need help and put a stop on this harrasment.