Hello my name is XXXXX XXXXX I will be happy to assist you.
Many companies will use the name microsoft support because they provide service for microsoft products however this does not mean they are part of the microsoft company.
Microsoft themselves do provide support plans or one time fixes.
All online tech support websites will say microsoft support and that simply means that they can help you with microsoft products.
I believe this website is the website of teh company you bought the support plan onhttp://www.omnitechsupport.com/
As you can see on the bottom of their homepage it says in small writing:
"omnitechsupport.com is an independent service provider of remote tech support. Third party trademarks, brand names, products and services is only referential and Omni Tech Support hereby disclaims any sponsorship, affiliation or endorsement of or by any such third party. "
So to answer your question, many companies can be a microsoft service provider, companies can also become a microsoft partner, you will usually see a graphic that says microsoft gold partner on the website of the support company.
You need to be careful when choosing an online support company because many are very misleading and charge large amounts of money.
For example this website you are speaking to me on is one of the only websites that verifies it's experts. As you can see next to my name it says verified and you can see my computer certifications.
But as far as Microsoft themselves providing direct support plans to users they do not do this. It is just other companies who have the ability to help with microsoft products.
If you need further help or do not understand something please do not hesitate to reply back and let me know.