MBD is harassing me over a Truworths account that's not mine

I am being harassed day and night by MBD for an outstanding Truworths account I know nothing about. I have called the so many to tell them they are sending their messages and calling the wrong number. I hy asked them many times to stop using my phone numbers **********ly. But they still continue. This is the messages I received: Dear MISS CP NGAMLANA kindly contact MBD LC on *** regarding your bought TRUWORTHS acc. *** Those are not my name's, how is my contact details used under this person. Why are they doing ********** activities using my contact numbers?