109, welcome to the Tech forums. Stick around here and you'll get the help you need from some friendly and experienced people---honest, too. I can only agree with what's been said so far. It sounds like you have been dealing with a shop that is dishonest or just not as experiencd as they should be.
For one thing, jsut about anybody would tell you that with a new bow if there are broken starnds in the string it shouldn't be necessary to replace the cables. If the tech did something wrong that caused broken strands in the string then he should be willing to admit it and replace the string at no cost to you. Let's just say that normally strands just don't break on their own.
In any case a good set of strings doesn't cost $100 unless they are Winner's Choice which are good strings, but nothing better than what many string makers put out these days (Hutch) and at much less money. Winner's Choice is kind of the pioneer of prestretched strings and as such are living on past reputation.
Now that you have your bow back I would do as suggested above and post some pictures and see if we can help you straighten things out on your own. If you are at all mechanically inclined working on a bow is not all that hard. You can learn from the process with our help and this has added benefits. The more your learn the more you can do for yourself. Then you'll have at least some general idea of whether you are getting ripped off if and when you need the services of a shop in the future.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver