I have a bug for account sign up

Hi

I was signing up a subscription yesterday. Before I entered the payment method I went to something urgent. When I came back the website page expired. After that I walked into an infinite loop.

I can not add any subscription after I log in. After I log in there isn't any setting or function allows me to do so. I cant sign up any subscription by using my current account since the website says the account already taken. Any idea how to help me? Thanks in advance

Kind regards

Chris