When I open Acrobat, a box comes up offering me a free month on an upgraded version. When I refuse the offer, Acrobat closes and I cannot now open files. I have paid for Acrobat Standard DC thru December! There is no way to communicate this problem to

When I try to open a pdf file with Acrobat Standard DC a dialogue box pops up offering me a free trial for an upgraded version.  When I decline this offer, it used to open my file.  Now it closes Acrobat, so I cannot open files.  I purchased this program in December, 2015, for $139!  Now I cannot use it because of this poorly programmed advertisement.  I am missing a deadline as I write this.  Sure wish there was a phone number so I I could talk to someone about this other than the WORLD.