How to reach customer support to unsubscribe?

I’m from Malaysia and I couldn’t call the customer support number. I think there’s a bug in my Avast account, I cannot unsubscribe the Avast Premium Security. No any button or option for me to unsubscribe…

My subscription didn’t show status. My order history didn’t show I have paid for it, but the transaction showed I have paid…Please help me I sent 3 complaints in May…I also reached out in Google Play and commented, they asked me to share my support case ID at support.avast website but I tried for many times it kept saying ‘The session has expired‘ everytime I want to send…I need help desperately ….It’s been 4 months…