Seems Sun Wing has a record of, "standing behind our reputation of honestly addressing any concerns brought to our attention." --Lawrence R. Elliott, Group Vice President, Business and Corporate Affairs
Sunwing Travel Group. 

These sites were found by doing a google search with the terms "Sunwing Vacations" and "Complaint", Sunwing and complaint (no quotations).  There are a host of sites, I've listed a few to give you the idea.
 

A helpful site...haven't totally read it, but could be useful.  http://www.tico.on.ca/faq.html

http://www.tripadvisor.com/ShowUserReviews-g147290-d269045-r3021082-Occidental_Allegro_Jack_Tar_Puerta_Plata-Puerto_Plata_Dominican_Republic.html

http://www.cta-otc.gc.ca/rulings-decisions/decisions/2005/A/C/371-C-A-2005_e.html

http://www.holidaywatchdog.com/3364-Mayan_Riviera-Occidental_Grand_Flamenco_Xcaret-Holiday-Review.html

http://216.193.236.147/frm/read.php?f=15&i=165&t=128&v=t

http://www.debbiesdominicantravel.com/travel16.html

http://boards.independenttraveler.com/showthread.php?t=775

http://travel.yahoo.com/p-reviews-366432-prod-hotel-action-read-ratings_and_reviews-i

http://boards.weddingbells.ca/showflat.php?Cat=&Number=725519&page=0&view=collapsed&sb=5&o=&fpart=1

http://mytravelboard3.com/playa/posts/82696.html

http://www.debbiescaribbeanresortreviews.com/mexico/gala.html

 

 

 

 

 

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