im stupid but please help

hi I have been doing some football betting and have had a dispute as my name wasnt the one on the account. I wondered if anyone could give me advice

I wanted to bet with coral for teir odds on a market and thought i had an account already although i hadnt used it in years.

it was an old account and I must have entered the details wrong a few years ago as I was at uni with a friend we just put a random name in...

last week I logged on - registered my card and bet for a whole weekend - winning £1450 (for a change) -  but they refunded only the the money a few days later and suspended the account. I cannot get the money as the name is not mine and is fictional - we put a random name in as we shared the account.

I must have bet all those years ago once or twice with my card and did not receive a refund on my bets

I know this is a silly thing to have done but wondered if there is any way you think I could get my money back? and how I could do it the quickest

Thanks for your time