Zynex8022 Stroke Recovery Systems Tens unit, leads, 9 volt batteries Littleton, Colorado

Originally my insurance was billed for this supposed top of the line tens unit:
7/16/2011 Home Med Equip  ZYNEX MEDICAL INC   $1,995.00

Then every month this company sent me 4 sets of sticky pads (leads) to connect to the tens unit that I purchased through them. Every month they billed my insurance for these amounts.

HOME MEDICAL EQUIPMNT  06/16/2011  $249.00
SUPPLIES  06/16/2011  $170.00
SUPPLIES  06/16/2011  $39.96

This last month they billed my insurance company under a different name Stroke Recovery Systems:
12/16/2011  Supplies MEDICAL  STROKE RECOVERY SYSTEMS  $209.96
12/16/2011  Supplies MEDICAL  STROKE RECOVERY SYSTEMS  $60.08

These last charges were charged as out of network and stating I had a patient balance owe of $60.08.  They were billed as out of area providers and paid at a different rate and leaving a balance for me.   I should owe nothing as all my coinsurance and deductibles had been met.

They have totally overbilled my insurance company with substandard supplies and this needs to stop.  I don't know how to inform my insurance company of this issue.