I'm not surprised mistakes keep happening if you're constantly requesting new limits on overdrafts and credit cards. It's a completely pointless request, and as with anything in life, the more often you do something, the chance of making a mistake increases.
As for the chip falling out, I've never had that happen with any card from any bank. Sounds like you're doing something wrong.
its not constant nor do i have an over draft, it mainly just if somethign for work comes up and i need to cover it, it would be a lot easier if work gave me a CC but even then the limits are so crap you have to call the office to get it changed.
regardless this isnt about my credit just a good all round bank that isnt santander