Why don't you try a service that is a bit more proffesional?? Language barrier or not, 
hire some people who know how to speak English correctly.  Or let the people who 
speak English answer the e-mails.

There are plenty of other services that are much better and have no language barrier 
problem and are much, much more professional.  I am sorry, language barrier or 
not, that is NO WAY to conduct business.

Good luck with Celga though!  Keep on *kissing* or *kicking* (whichever you prefer) 
their ass!
:)