Foxtel has been bombarded with irate messages from customers upset that the pay TV company has run ads from opponents of same-sex marriage.

Fairfax Media, the publisher of this website, has also attracted some angry comments for running the Marriage Alliance's ad online.

Customers have been telling Foxtel they will cancel their subscriptions on Monday and leaving rude emojis on Foxtel's Facebook site.

In among questions about bundle bills and where they can watch The Walking Dead, viewers have also left messages like, "disgusted you gave voice to such a shameful and discriminatory ad for the Marriage Alliance".