What they are trying to suggest is that they look at the customer-relationship with a new way, they treat the customer differently than old-fashioned banks and financial services companies. They are trying to sound young and energetic and customer-oriented.
(This of course is rubbish, they are a financial service company who make money from their customers the way all financial services companies make their money - they charge their customers fees and percentages.)
It is always a good idea to be aware that not all the language in advertisements makes sense - it is intended to sound good.
"fresh thinking" is marketing-ese for "creative," "new," "out of the box."
It means that the company is making a tactical change in its marketing strategy in order to attract different or new customers. Instead of helping customers find "fresh" (new/creative) ways of investing their money, the company is now focusing on customer service.