WHAT HAS HAPPENED TO THE SILENT T

This is a bit of a rant.
Now I can't speak French, except that if I go to France I am able to do a basic greeting and order a meal in the language.
I also may have an appalling accent, but I do know how to say words.
One of the things I was taught about French many years ago was that generally the 'T' is silent at the end of a word.

So how come UK adverts about French things have suddenly started pronouncing the T, as in MoeT I always thought the correct pronunciation was Moeay. The same is true of YSL product Touche EclaiT I thought that also had a silent 'T' as in eclair.

This means that people in this country are being taught in ignorance how to say French words in an even worse way than possibly before,as in bad accent but right essence of the word.

So how long before Renault cars become RenaulT.

Has the French language changed, or the adverts just pandering to the lowest common denominator? Which if so, is appalling and so ignorant on the UK advertising industry.

Or do I need to relearn those words with a hard 'T'

I'd love someone to tell me what is going on.