If you were advertising anywhere but the Trade Services channel then you likely got reported for doing that. It is considered spam, and advertising in the wrong channel, and not allowed.
All chat infractions are considered “abuse of the chat system”. So while you did not say anything horrible from the sound of it, improper advertising is still under the “abusive chat” category.
If that is what it was for, you will want to stick to using only the proper advertising channel.