Temp Banned? Help!

Hello, my friend got temp banned and asked me to log into his account to do a trade for him. Doing this got my accounts temp banned as well…I didn’t know you weren’t allowed to do this nor did I know this would result in my accounts getting tagged. If I did know, I would never have agreed to do this for him. Is there any way to get my ban removed? I play legit and have never used any 3rd party software and the ban looks to be around 2 weeks long…

Thank you.