How do I get to executive care customer support.

I have had several visits from xfinity and they still have not fixed my internet connection. I am trying to get someone to reprovision my internet connection. Since the 2000mb package upgrade, I get around 24% of my speed and this has been a week now. The techs who come out say they cannot get the backend people to reprovision and I am at the end of my rope trying to get help. India is useless