Morrisons complaint: UNPAID PETROL

Girl forgot to charge me for my petrol as she was distracted reading the paper, and only charged for the cigarettes I bought which at the time I didnt notice as paid by credit card , since then I had the police round to say I had fueled my car and left without paying , I have rang morrisons main line and got the number 01274639547 to pay for the unpaid fuel , but they cant take my payment as it hasnt been regestered as an unpaid fuel bill , I would have thought that should have been done before putting the police to my house , now eventually just been put through to the fuel station where this happened , and girl listened about what happened a cut me off, this is awful service as I get my fuel from there all the time , im working from home and cant leave to go round to sort this out , then Im getting picked up at 5 to go away for a long weekend , please help me, all I ant to do is pay for the fuel ,my mobile number is 07752381401