I parked in my local station car park at 10.32 and paid for 1 days parking (£10.10) via my credit card. I have used the machine before and expected a ticket plus a receipt to be issued, but only a receipt for £10.10 came out of the machine although I waited 2 or 3 minutes.

On returning late at night I found that a 'civil parking notice' had been issued by Alcoa at 13.53 for the sum of £50 (becoming £80 after 14 days). The attendant who had issued it had written "Displayed only credit card receipt - no ticket. No fault found on pay machine".
Could you please advise on my best approach to contest this?