Need Emergency Help

Hi,
There is some serious issue on my website after update the theme,
- It doesn't work properly on Mobile Phones, at all (which is how people browse the web these days).
- It doesn't adjust properly when you resize the screen (Google recommends RESPONSIVE Websites rather than ADAPTIVE)
- It's hard to read on larger displays
- The design looks really, really dated compared to some of my competitors

You can try to open my site on your mobile so you can observe and understand those point / problem.

In general when I open my site on mobile it should to open my shop home page directly, but it shows or open my blog site page,
main issue / problem is my site doesn't work properly on Mobile Phones after Update the Theme, when I or everyone enter my site address on browser my site does not showing home page, its showing / open my blog site which is very Annoying also not Right, normally its should to open my site home page.

Please help me out from those bad issues, and give me details info so I can fix those problem. Hope you reply soon as early as possible.

Thank you