Bank give no protect to their customers

Even a single star is too much for this inept bank. Banks are bullying people into signing on for telephone app banking. They refuse to answer queries on the phone if you don't have the app. Even if you have on line banking they will not help. The reason I was asking for help was because I was dealing with a very ***** car hire company that had my credit card details. In order to prevent this company from taking unauthorised money off my card I cancelled the card and paid my bill to them from my savings account. In spite of cancelling the card, and with no communication from the bank and no authorisation from me and five days later the bank allowed this car hire company to take money off my account.... how is this possible? After trying in vain to put my case to the bank on the telephone and getting nowhere I went to my local branch and requested a dispute form to fill in. On that form I pointed out that I had cancelled my card and yet five days later they put a payment through. The bank phoned me back and said that I had not followed the correct "process". I needed to relay to them my communication with the car hire company. As this was done on WhatsApp through a booking agent I was told this would not be sufficient I would have to forward communication (that I didn't have) with the car hire company. I fail to see that as a customer of over 50 years standing I need to explain myself. The bank has failed to protect me and it would seem that any merchant who I have dealt with in the past and given my details to, is able to debit my card. I am truly disgusted and disappointed.