CREDIT INTEL ****S AND HARASSING PEOPLE

I have received a outstanding account of R1933 from Credit Intel on a message about a year ago. I went to Centlec Bloemfontein and have gotten the proof from Centlec Bloemfontein that i am not owing anything to them. I then mailed the proof with zero balance to them. After obtaining me email address they have now started to send me terrible messages and emails. They could not provide me with any documentation of the said account, This account is 20 years old since i vacated the property they say i owe money.