How long will a bottle of Brights President Grande Reserve Canadian Champagne last?

In August 2012 my family and friends were celebrating a special occasion. Brights President Grande Reserve Canadian Champagne was being served to toast the occasion. Much to our disappointment (and embarrassment) after opening and serving the champagne none of the guests could drink the beverage. Many people complained that the champagne tasted spoiled. Needless to say we were very upset and had nothing else to serve to them. This experience was disappointing and costly.

We have used this champagne in the past and were always very pleased with the taste. What could have happened?

Sincerely

Linda

clinda6@yahoo.ca

(905) 820-8485