After transferring my entire credit card balance out of Sainsbury's credit card. I then discover a few weeks later that they had then charged me interest on my previous balance and marked me missed payment with credit agency? Found this totally bizarre as paid nearly £4000 that month to clear the balance. They have impacted my credit score I had no knowledge whatsoever - the problem with Sainsbury’s credit card is it takes ages (days to weeks) to update you cannot see your balance in real time like other ‘real’ banks. Really disappointed with the service avoid at all costs, very clunky app and with only an out dated balance previews mechanism. Lethal, avoid.