WePlay Phone Number Already Bound to Another Account During Verification

I am facing a safety verification problem with my Weplay account. When I try to log in and verify my account, I receive an error message on the SMS verification screen saying “This number has already been bound to another account.” Because of this, I cannot complete the verification and properly access or secure my own account. My account is linked with my Facebook login and this is my main and only Weplay account. I do not use any other account, yet Weplay keeps taking my phone number as already bound, even though I just want to use it for my own account. I contacted Weplay support, but the replies are very late and until now the problem has not been solved. I kindly request that my phone number be removed from any other account it is bound to and be properly bound only to my own Weplay account, or that you provide another solution so I can pass safety verification and use my account normally.