From the sound of it the situation was handled according to the rules, the captains discussed it and agreed to mark it as a foul.
A provisional ball is only needed if the captains can't agree, but since they did its settled.
Rule 10 – Provisional Ball
A provisional ball or frame shall be bowled when a protest involving a foul, legal pinfall or a dead ball is made and cannot be resolved by the two team captains or a tournament offcial
I wouldn't worry about anymore.