e-filing p35's

i file for a number of employers but not as agent.

for a number of employers i enter p14 details. i get as far as signing off the p35 to get into an error loop. system then tells me to put numbers in boxes of p14 which are already there. go to next error loops back to previous error.

also one employer - 3 employees - complete p14's - get to summary which is for 7 employees. summary of tax and nic for 3 employees does not add up.

any one else? any simple fix?

hmrc help desk has been no help for over a month.
St.John Soulsby