Zohobooks website software error "ACCESS DENIED" even though browser is upgraded to version 67

Zohobooks website software error "ACCESS DENIED" even though browser is upgraded to version 67

Hi,
It doesnt matter which upgraded browser I am using, Zohobooks website says "ACCESS DENIED" upgrade browser. I have version 67+ of Chrome and still this message is coming. Screenshot is attached. I am also unable to access the helpline even at 9:08am in the morning. It says all operators are buy with customer calls. I have left multiple messages but no call back. I need to file my tax returns as 31st July deadline is approaching, and Zoho website has just stopped working. Please help ASAP.