Capped at 100mbs for the last 6 months.

Was paying for 800, then 600, now 300 and my speed test shows  93mbs.  Called on phone for no help. Can't access router from PC.  App is Android.  Tablet / WIFI same 93mbs.  Getting ticked !!!  When paying for 800, was getting 8oo+.  No wires or settings changed.   Tech on phone says all good, no problem.   Any help would be appreciated.