It seems similar but not exactly as ours was a sending off suspension and not a player being cup tied. Our Secretary followed the process outlined to all Club Secretaries about checking suspensions with the Sfa. We were advised, after following the correct process, that Kev wasn't suspended.
If they followed the correct process, which I'm not sure of in this case, and someone has misadvised then I'd say it should be overturned. If they haven't followed the process as expected then unfortunately regardless of anything else it's cut and dry.