All you can do is let them know how you feel on the bulletin page, which I do almost every week now. It really is beyond a joke and I may give up my membership this year.
When Explorer didn't work I used Firefox...this has worked for me in the past as well.
Having accessed the site I found there was no Sunday Cryptic, but there was a Sunday Jumbo.
Having downloaded that puzzle I found that while the grid was correct for the first few clues, it soon became obvious that the The Times had done it again-provided an incorrect grid..
By the way, the answer to 1ac is Christmas Day..