I have purchase the ebook from ELSEVIER on 2016, I can read through the adobe digital edition by opening the eBook until last year, but I cannot open it these days, the adobe digital edition ask me to provide the Adobe ID and password which was authorized by the supplier. I don't think I had got the Adobe ID and password when I purchased it. I e-mail ELSEVIER and ELSVIER recommand me to register an ID. The ID and password I register are not working. What should I do to solve the problem?