Well you just said “laser is not permanent” and left it at that, which is what I’m disagreeing with. Laser will permanently remove hair but can’t do 100% of it (hence the name “reduction” instead of “removal” despite the fact it does actually remove hair). It’s really legal semantics more than anything.
The fact all your hair returned in 5 months suggests to me your place didn’t use proper settings and justified themselves in saying that but saying you will need long-term maintenance treatment forever (which if proper settings are used the first time out, you don’t need this “maintenance”).
I actually looked up your Sona MedSpa, which is a chain (which is a first red flag for me) and all of them have some pretty god-awful reviews (another red flag). Honestly, those “medical spas” almost always will use poor laser settings. You’re better off going to a dermatologist and doing it right the first time (I’ve generally found dermatologists to be more willing to go aggressive with settings).