Presumably if they want to change the contract I entered, and I refuse, the contract has to stay the same. Sometimes this may be impractical for the company, so can I get a full refund in such a situation.
For example, Samsung recently updated their terms of service to show adverts to users on the menu. If this makes my product unfit for purpose, what can I do to get my money back?
For reference I am in the UK, but I would be interested in global answers as well.