I think they should pay you.
BTW sound FX like balls bouncing etc are usually faked in Post. so no need for a mic, although a big fluffy one will give you a Pro-look.
= Football - er, somewhere behind a strong grille I think . . . and let your insurer know.
If this is a 1-off event, you should get to practice-days beforehand to collect ideas, spare shots etc.
Hope that helps.