The worst customer service possible!

I am getting constant calls and sms from Truworths/Markhams looking for a B Mankge - and I have told the callers that this number that they phone to is not his!!!! I have no clue who this person is. They need to stop phoning and sms me!!!! I don't even have a TGF account buy this constant calling and smsing will make sure I never become one!!!