STILL having Problems with phone and net

I have charter and have to call them almost daily since May 9,  I have purchased a new ethernet, put in two modems from them and their techs say that the modems and or parts are outdated and blacklisted.  I have been told it was my computer took it in to local repair- they say the computer is OK, put in new ethernet controller new wires at Charters request- still problems.  Finally on the 20th of May they came out.  The tech put in all new wires to pole and house, and took the two modems with him.  Things worked for about 10 minutes and went out.  He came back and messed with the computer and had headquarters do something.  He reloaded drivers for the new ethernet.  still it didn't work, then he tried the original ethernet controller-  It worked.  But still after two more tech visits. I am still having problems.  This has been going on for a month!!!  It will cost me $150 to break the contract with Charter.  I have already put in two visits to a computer repair for a computer that works perfectly when connected at the repair shop plus a $50. ethernet, even changed computers and all wires and still have problems.  May be I'd been better off paying the $150. after the 10th call.  Hind site is always better.