Which is correct:
1-They charged me for their services to redecorate my apartment.
2-They charged me for their services for redecorating my apartment.
Their services consisted of redecorating my apartment and the charged me for those services.
I get the feeling that in "2" they might not have done the whole redecorating themselves.
I would just say their services redecorating.
The simplest would seem to be:
They charged me for redecorating my apartment.