How to I leave a review?

A long time xfinity customer, I’m a senior who recently switched to the xumo streaming package to save money.  It is turning out to be a nightmare   My family set the new contraption  up for me, but it had glitches.  For days, there has been one hurdle after another.  Hours on the ‘’chat’ didn’t solve the issues.  (I was told to disconnect items, plug it back into another port, restart, and a myriad of other instructions, including going to another link). After all that didn’t work, a service call was set up; a rep came out and everything seemed to work fine.  Now, a day later, the  second tv won’t turn on though the xumo box does.  This is overwhelming.   How do I get to speak directly to a rep without going through this all over again?