I received a fine in the post on friday for failure to pay eflow tag for journey that happened in september. Now I have only been twice over the m50 bridge and paid one and recieved notification on the other, I paid online and have checked payments that they went through. I kept copies of the email receipts but got rid of original requests. I notice one of the them which I think relates to the alleged date of offence has only one reference number. Before I ring to query has anyone come across problems / mistakes with acceptance of payments.