You really need to talk to a debt adviser at your local Citizens Advice Bureau. They will be able to discuss options for getting you out of your current situation.
Most high street banks do make an effort to be responsible lenders and that is why they are rejecting your applications. Wonga is not a responsible lender so they will happily take all of your salary each month and leave you with nothing to live on. Through the Citizens Advice Bureau it should be possible to negotiate a settlement of the Wonga loan and then you can start using your salary for "general living". Certainly borrowing more will not help your debt problems.