French Employment I being ripped off!

Hi there anyone onhere that knows the ins and outs of French employment law....???? or can put me in touch with someone English French is not bad but the intricacies of contracts and stuff are beyond short I am workiing on a CDD in France for an English employer as a Holiday Rep... am paid the SMIC.....some disputes over the working hours stated on our contracts.....what I need to know is that if you are obliged to have your work mobile on for 24 hours a day for 6 days of the this in breach of French law seeing as my actual contract is for 35 hours a week and I do not get paid overtime? cannot find any info about this on willing to pay to speak to an english speaking employment lawyer!! Thanks