Just wait out the ban, dont ban evade (post anywhere else in the forum apart from in Meta) during the 7 days or they could make it a permanent ban.
Thanks I got it. I just want to understand where I was wrong to avoid problems in the future.
Its given there. Participating in on-forum altcoins giveaway. It means that you participates in an on-forum airdrop/giveaway where you post your Telegram or other details. It's not allowed. Read the stickied thread there.