Harrassment by Fin choice agents

Yesterday i was on the internet looking for some financial institutions then i came accross Finchoice, i submited my contact details there for a call back, shortly after that i received a call from one of their agents who without even giving me an offer rushed to obtain my banking details which i found to be strange, i asked her why is she rushing for banking details she said it is for banking validation i can give her any account number even if im not using it, that again raised eyebrows, i asked her to call me back, another agent who claimed to be the senior consultant called me back asking for my banking details,i told him im no- longer interested and that was fine, within 5 mins another agent called me and i told her i already decline the offer and asked not be contacted again because these calls are disturbing me im busy at work, she rudely told me that unfortunately they will keep on calling me they will not stop, i was shocked, and she was right my phone has been ringing non stop since yesterday, today alone i have received more that 10 calls from them already, my phone is ringing non stop, they are busy harrasing me and im at work, i have never seen anything like this and my true caller says the number they are calling with is a loan **** ***)