Hi megd22 and welcome to the forum!!

High chlorine levels will take care of themselves with some sunlight and time, but I would first tell you to
run, not walk, away from that pool store. If they can't measure chlorine, then there's a HUGE problem. I am also suspicious of their estimation of the volume of your pool. One of the other mods has coined the term "pool-stored" to describe people like you who added what they told you to to no avail, except making them richer.

First and foremost, you need a good test kit. We recommend the Taylor K-2006. It's a bit pricey, but much less than what you've already spent on chems that don't help, and will save you its cost tenfold over this swim season. In the meantime, go to WalMart and get the 6-way kit that sells for around $15. (drop-based kit, NO STRIPS!).

Then come back and run a set of tests, then post them for:
TC, pH, TA, Ca,and CYA. We also need a list of what you've already added to the pool (ingredients, not just "shock"). Armed with that information, we can help you get it cleared up.

Janet