meladerm for acne marks

I have been using meladerm religiously for five weeks for freckles on my face. I use it twice a day but much to my disappointment I have not seen the slightest bit of difference! I am on my second bottle of meladerm and consciouse that i have spent nearly £100 on a product that may not work. However i shall continue until this bottle finishes and i hope i see some results. I will keep all posted.