Why not rent a power snake and send it down the kitchen roof vent yourself and then treat your drainage lines with root killer. Let the cable go all the way to the base of the stack and then put out about 20 to 25 feet more of cable. Sounds like they unblocked one line while clogging up another.
"they want to charge me another trip fee of $70.00 to come out and run the snake through my kitchen drain again, we fought with them to get them to waive the trip fee but they said that they have a pretty good feeling they are going to lose their snake if they try it again, then we will have to rip up all our piping."
HORSE HOCKY! They were just blowing smoke. Even if the snake broke off in the line it would be no big deal. They make a tip called a "cable retriever" that hooks on to the section of cable in the line and snags it out.
"The plumber guy I know said he has some extremely powerful pipe/clog cleaner stuff called WAMO, that I could get from him and try. Something only plumber/companies can buy, can't get it at stores or purchase it online."
WARNING ! I can't pull anything up on WHAMO but if only plumbers can buy it sounds a lot like BLAST-OUT. This is a sulfuric acid based drain cleaner so powerful that the public can't purchase it. And for good reason. Two years ago I lost a friend that died while using it in a unvented bathroom and this man owned his own company and was a master plumber. STAY AWAY FROM IT. IT'S DANGEROUS!
TO keep those roots under control RootX or Robics Foaming Root Killer that contain Dichlobrnic are two products you could try.
A less expensive way would be to call around to garden supply stores and ask for fine grain Copper Sulphate. Put a 1/2 pound in your toilet and flush it down. Repeat in 6 months.
Goodluck and let me know how you make out. Tom