Signed up for a 2nd UB account to get RB - now its frozen

[Honest-UK]

So I've had an account with UB for a couple of years. I'm now playing full time so wanted to take advantage of rakeback. I signed up for a new account using TTRB as my referral. I then transferred funds from my old account to new and started playing. TTRB started listing the RB I was earning so everything looked good.

Things were fine for a couple of weeks but now my new account is frozen and when I try to log in it says 'Invalid User Name'. I can still access my old account ok however.

Has anyone had this happen to them? I thought you were allowed up to 3 accounts? Are the funds in the new account I set up safe? Am a bit worried as there's quite a significant amount in there, so any advice/info would be much appreciated.