Never gotHorizon parking fine letter, get debt recovery + letter 5 months later!

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I I got a letter from Debt Recovery PLus last week about parking fine at a Sainsbury's car park 5 months ago. The letter is a template and badly written. I am reluctant to deal directly with them. Reading many forums, am a bit confused. One person said the same happened to her and Sainsburys SAID that too much time had passed so they couldnt help! I had found in my bank statement that I had shopped there on the day in question and taken cash out the day before. My dvla details and address are up to date, dont know why a letter from Horizon was never sent/arrived; the DB+ letter came to my correct address.Should I ignore it all, or contact Sainsburys or Horizon? According to the debt letter, I only have 14 days from when I recieved it, over a week ago until they go further. . They DR+ want to charge me £140.00 but I dont know what the Horizon fine was originally.