Account closed due to previous self-exclusion with another brand

I registered with this casino last week after receiving a promotional email and deposited £350 which I played through with a little balance remaining.

When I tried logging in 2 days later I received a message saying my account has been closed due to self exclusion. I have not excluded myself from this casino but they are part of the cozy games group and I do remember excluding myself from several of these casinos last year. I cannot contact support to aid them any questions as every time I attempt to complete their contact support form I get an error message - every single time. There is no telephone number or other contact details give on their website.

I am quite miffed at this as I cannot log in and claim my remaining balance. Also, why did they wait 2 days to close my account when I had not excluded myself from their site? I understand that it may be linked to the previous cozy games sites I excluded from so why did they allow me to register here (with the exact same personal details including email address and payment card)? Please help - I just want them to answer me and explain their actions. If they are in breach of their self exclusion policy I would like a refund of the deposits I made.