I Can't Log Into My Zula Mobile Account After Gmail Option Disappeared

I am unable to log into my account on Zula Mobile through my Android device. My account was linked to Google (Gmail), but after the latest update, the Gmail option completely disappeared from the login screen, making it impossible to access my account. I tried to contact the support team to resolve this issue, but I could not reach them. My account contains purchased content and valuable items. My registered email address is m*********@gmail.com. I request that access to my account be restored, and if this is not possible, I demand a refund of the payments I have made.