********* business practice

So a few days ago I received a email stating that I owe R1214 to a company called Computech credit service who advised that I apparently stating that I signed up for a loan from them. I never once heard about this place and suddenly they have my ID number and my banking details which I never give because of the world we living in now. I'm so upset and disgusted I spoke to a lady in their legal department who gave me this number *** to get hold of them but theirs no answer. I'm disgusted in the fact that people will do this in the times that we currently living in.