Well after four e mails .... and four screen shots showing the cheaper rate I finally got my Best Price Guarantee accepted ( 2 months ) but prior to arrival at hotel.
https://nustay.com gives slightly cheaper rates - Hint do not register or 1) Accor will not accept and more important 2) price increased on both hotels I looked at ....
So when we check out I will now by 6.44€ better off ( well it did take about 3 h of my time ) so prob will not even think about it in the future but just wanted to see how difficult it was. Hotel has been asked to give me this in cash at departure.