Harassment from third parties

Last week I received a call from *** The person claimed that she was working for a company that is contracted by Standard Bank to do research for them. I was asked to provide information to this person. The information was apparently intended for use by the management of the Blue Route branch. This is strange considering that I have never used that branch. Also I never gave the bank permission to provide my details to this company. This is in addition to an SMS received from Wonga offering me a loan. I object to my information being distributed by this bank and have never given permission for this to happen. Please explain yourselves.