my microft store does not work.

I have been trying to get on to Microsoft office, to down load some games. On my Windows 10. But, every time I click on my Microsoft store, I pops up and just disappears  in a few second.   It does not give information, for the reason why.  So, I called HP, sinse my computer is and HP Desktop computer, any ways.  They said that there is absolutely something wrong, with the program and I would have to get a hold of Microsoft, to have it fixed.  But, they must have given me the wrong phone number.  Because, I absolutely could not reach them. So, if anyone has their phone number, would you please let me know what it is, so I can get a hold of them right away.  But, if you absolutely know how to fix it. Would you please let me know this, also.

                                                                                                                                    Your Sincerely Rockie