Very spotty customer service but a beautiful ship

My main issue with this cruise is that  the level of customer service (dining, room service, activities, etc) we received is very spotty.  Some are okay, a few is good. A number of them terrible.  We are avid cruises with at least 2-3 cruises a year.  With other cruiselines, we have received top notch service throughout the cruises from each department.  However, this cruise has some real issues with customer services.  Especially in the housekeeping, room service and dining areas.  

Also a note about .  We did not get the 50 onboard credit promised we would get.  The booking agent failed to inform me that within certain period of time I had to fill out a form in order to get that credit.  As a result, I had lost the credit.  It is a mistake on their part and totally unacceptable.  I will be booking my cruises elsewhere.