***** on my name

I had a contract with vodacom which expired about 2 years ago but after it expired I was sent a bill of R1337 by vodacom I went to vodocom outlet to enquirer it was determined that someone committed ***** using my details then I was asked to fax my ID copy and affidavit of which I did. When I followed the matter up I was told it was under investigation I will be contacted after investigation now I got a letter of demand from vodacom attorneys that I should pay up<br> <br> Please help to clear my name