Then, unfortunately, it seems you appealing was the problem. The ToS are quite clear - all clan members receive the ban, regardless of responsibility, no exceptions. If the ban was not long enough to cause delay, but you appealing extended the ban to be long enough, then that is a problem with the process (since it should not result in extending the ban) but it is also a problem caused by you appealing, since there was zero chance the ban would have been lifted.
It is certainly an unfortunate situation, and arguably an unfair situation - but it is also a matter of personal responsibility, as the rules make absolutely clear. I would say that the rules make it very risky to clan up with anyone that you do not already know very well to begin with. Arguably this may push more people to play solo or in smaller clans - but either way, the rules are clearly stated and clearly posted. It is highly unlikely that anyone was going to make a special exception. An appeal should not extend the duration of the ban, that is an issue, but there was little to no chance it would have been successful.