A pretty well known local company installed me a mini split system, and only after they finished the job and I was about to invite the inspector, I noticed the permit is not approved yet. In fact, they did not attach plans and I have to beg them to do that so the permit could go through. I did pay them to get the permit and they attached me a receipt as a proof they have it (now I understand it was only a proof they submitted an unfinished application).
They are very slow to respond and I'm not 100% sure if it's going to be approved (who knows if they satisfied all the requirements).
Is it a severe violation? Should I sue them if anything goes wrong with the permit? Am I overreacting?