I don’t know if it’s a mistake somewhere , but the 7 days suspension was introduced when decay timers were up to 7 days , so that the suspension would automatically leave you with nothing left on the server you played on.
Maybe they forgot to change the suspension warning message when the decay timers were increased to 10 days , and the suspension is now 10 days to keep it consistent with the decay timers and previous punishements 
Anyways sorry for your loses and welcome to the club