Avast cleanup premium cancel auto subscription

good afternoon, i am wanting to cancel my auto sub, but have still not got my email with order number on it to cancel,

have tried other methods but still no joy,

can anybody please help

https://support.avast.com/article/24/ (Orders and Renewals)

thank you for the reply, i have tried them but get no joy, as I did not receive my order email

Contact support: https://support.avast.com/contact