what do i need to do for cancel my membership

i started to use avast about 2 or 3 days but I dont want you use iit anymore
ı bought smart scan pack and clean up pack and ı want to cancel bpth of them
how can I do it ?

Remove the software from your system if you don’t want to use them and disable the auto-renewal.
https://www.avast.com/faq.php?article=AVKB126

no man
ı am not happy with avsts servise so ı want my money back
when ı purchased for first time it was sayig that "30 day rebate gurantee

You need to submit a ticket.
https://support.avast.com

I dont get it ?

If you want a refund, you need to submit a ticket.

do you mean receip ?

No I mean a ticket.
Go to the website I gave you and submit a ticket requesting a refund and cancellation of your subscription(s).

Submit a ticket >> https://support.avast.com/support/tickets/new