Solved Problem to buy app in Windows Store - exists any MS mail support?

Hi!
I bought in Windows Store on my phone (Windows 10.1611 Mobile) app Sticky Notes Pro without problem.
There's rebate to end of Sunday.
Vesion for desktop is available too, so I wanted to buy it also for desktop.
When I click Buy, after few seconds error message appears:

In English:
Try it later
On our side occured any error.
Close

I tried to contact MS support - impossible without phone or guard/guide (sorry, this translation is maybe incorrect) - simpy - I need to send mail only and get a reply.
Has MS any mail support? 'Cause mail support is for trading its products, help with activation or for Qs which are not relevant.

Thank you for help.
Miro

Unbelievable - always was the same error and before writing this reply I was in Store and it shows me "You're owner", so I installed it.
So, single buy for both Windows - Mobile and Desktop.
It was really problem on their side...
Miro

Yes, it's solved
Miro