Employer reduced salary & work time during maternity without consent

I am working for a company and I joined in October 2017. I confirmed to my HR in the month of March that I am expecting. She is based out of Canada. Each time in our touch base calls she would ask about my health and I would tell her that everything is fine except for the usual morning sickness, but I never mentioned that I wanted a flexible option to work nor did I give in written asking for the same. However my new HR got back to me with flexible work options and said that I could work for 5 hours a day and she put the same in a email, however I had clearly told her that I would like to discuss with my family and then respond, but she was in a hurry to close this and she made me respond to the email accepting the option given. And she made the email look like I had requested it. So when I asked her about the salary, she said I would be given only 50% of my CTC, and i felt it was wrong. They are cutting my salary and am not sure if I would be given full pay during maternity.