Please remember never to provide sensitive information to any cold callers! This will eliminate 99% of scams, as without obtaining your details they cannot do anything. It's very easy to be fooled! Don't feel bad about this; it can happen to anyone when their guard is down. The rule of thumb is to avoid handing over passwords, bank details, or gift card codes. Scammers are able to replicate official-looking texts, emails, etc., but be doubtful. If you're unsure, ask to call back later and say you'll phone thep company directly. If they start getting jittery or make excuses, put the phone down. In the US, offers must be extended to allow you to think about them. I am not so sure about the UK, but I would assume it would be similar and therefore not allowed to pressure you into a sale.