Harrament from westbank

I have been harassed by Westbank with sms's for months now, I do not belong to Westbank and have never app**** for a loan from them either, I have no idea how or where they got my number from, even though I Block the smses they still keep coming, I have phone the number that they give on the sms twice to ask how they got my number and nobody can give me a answer both times I said to take me off the list, I still get messages!!! They refused to talk to me unless I gave my ID number, now they msg me telling me that my application for a loan is being processed what the ****!!! Can somebody please help me stop this!!!!