Redundancy Payments Service

Has anyone been able to get hold of the RPS since they changed their online platform?  I have been trying for weeks with no success.  Either the phone line rings out or I am left on hold (currently 25 mins and counting!).  Any ideas of how to contact them to get a response would be gratefully received - I have a number of employees where no payment has been made the RPS appear to have lost the claims.