[blml] 1NT-P..correct 1C-1S ..

[koen]

We have 3 "Club TD's" (Posting here I had to put these quotes ;) ) at 
the club who know a bit about the rules. They are also playing at the 
club tournement and as a consequence they don't have the required time 
to direct.

MP's: S/All
South opens 1NT (15-17) and West passes.
Then South corrects to 1C and West (one of the playing TD's) tells South 
that by making this change he will score a maximum of 40%. The other 
TD's are not called because they are busy playing. West tells the table 
he keeps his rights and bids 1S.
South has 4=4=3=2 and 14 HCP. NS play 5 card majors and 4 card diamonds, 
making 1C the systematic bid with this hand.
The final contract is 3NT by South and this makes for an absulote top 
because EW don't cash their Club tricks (East had a 6-card Club)
When entering the score West sees that this will be a zero for them and 
calls you.
Asking South why he changed 1NT to 1C he tells you that he mispulled, 
but this is not really convincing to you.

This is all info I remember. Hope it is sufficient. How do you rule?
Does it matter that West is one of the club TD's?
Thanks,
Koen