Rgford80

Hello I recently had a new above ground pool installed by a pool dealership. They used a vermiculite base when installing the pool. They didn't mix the vermiculite with anything. They just poured the bags in dry and smoothed it out some. Now my pool floor is very mushy and even walking results in foot prints. It also has lots of small wrinkles. I have also noticed 3 rocks have already surfaced and threatening to puncture the liner. The pool store says all this is normal. I'm new to pools and don't really have much knowledge. Does this sound like a normal install? Thanks in advance for any advice.