the things you should do:
- turn on VPN
- change password
- wait 1/2 days
then contact support and tell them that you had a virus on your PC and you lost access to e-mail, lol accounts, all social media etc.
after that they will ask you when you've been logged into your account last time. tell them that last time you logged was 1 day before you injected windsharp
they will ask you many questions to confirm you are real owner (champions, skins, first purchases, some RP purchase IDs etc).
If you will pass that exam they will bring back account to date, which you said as last login date.
It worked in my case few months ago when I injected hanbot and got banned next day
Sadly , now i checked i got permabanned. 1100€ gone , rip
Since account is already banned it's even better.
do the steps I showed above (you don't have to wait few days. just wait few hours) and account will be returned to you. trust me