Harris mentioned by the debt collector company that OF Mr zprice

A company call me in behave of Mr Price.When I ask them to give me their company address ,Registration nr and what is the last amount I paid they did not want to provide me the details. The guy then treaten me that they will charge me for every call .This is HARRASMENT as every week they will call even if I did make a payment. I have the right to know the exact details of the company that is calling if they do not give me te details I will contact NCR to report this matter