Abused by HOA. Need help!

My tenants didn't not report leaks in the bathroom to us and tried to fix it themselves and failed. Small leak became big leak and leaked to someone else's unit downstairs. HOA called for service without notifying us in advance claiming they don't have our phone number. We actually gave our number to president of the complex on a board meeting 2 years ago. But the management company changed hand 4 times during the last 2 years. My question is:
The leak was reported by someone else to HOA on Friday night. They sent a plumber to look at the leak without doing anything for 1.5 hour at $186/hour.
Another plumber showed up to fix the leak inside my unit 10AM on Monday. The manager din't call us until 10:30 AM. We rushed to the site at noon(we live 1 hour away). He was already fixing the bathtub leak. They wouldn't gave us estimate when we were on site. After we left, according to plumber's report he found the toilet leaking and started to fix the toilet in addition without notifying us. We were not notified by the toilet part until we saw the report 1.5 month later. The plumber charged $93/hour for 7.5 hours. They wouldn't provide us the report earlier. The management company also charged us $1400 to manage and repair the dry wall on a small closet downstairs: 10hours at $65/hour for cordinatinging the repair and $750 for the actuall repair itself. My question is:
1. Does management company have the right to rush into my unit to repair without properly notifying me, claiming emergency? In this case, they found the leak on Friday, but didn't start working on it until Monday. Doesn't seem like emergency to me.
2.For the damages in common area, can management company use their own employees to do it without other contractors' price bidding?
Any advice is appreciated.
Thanks