Council issue/ FPN

I’ve just recieved a council £400 FPN for fly tipping, about 5 miles from where i live.

I did not do it.

The only “evidence” they have is an old bank statement, that i know is years old, because it isnt even my current address. I have no idea how it was obtained, but it hasnt been my address for years.

The letter asks for a payment of £400 otherwise I may get an unlimited fine and imprisonment....

BUT I DIDNT DO IT!!

Please help

I’m losing my mind here with worry. Please shoot me any advice if you have any, because to be honest ive never felt such an injustice