Frustrated

I am currently in the U.K. And before I went asked if they could send my O.T.P number to my email address because my phone no has changed to a British one. I am currently in the process of renting a place and desperately have to pay for rent and a deposit. Every time I try pay the money it asks me for a O.T.P pin or try access my internet banking it gets sent to the no I don't have any more. I have emailed, phoned every number spoken to just about every one. No one can help me the best they can do is say go to the nearest branch, how am I suppose to do that when I'm in the Uk? I'm getting extremely frustrated this is my money and I cannot access it all I need is some help to either get my new number put onto the system or send the O.T.P no to my email address . If not I will be homeless.