Disappointing end to property purchase

Mitch was the agent for the sellers of the property we purchased in October this year. He initially was great with communication and information (especially as we were overseas for the first week after offering). At times he was did not communicate with us directly however he seems to have a team behind him doing all the administration, so things still got done. As we got closer to the settlement and arranged the pre-settlement inspection things became frustrating. The pre-settlement inspection was completed prior to the owners moving their things fully out of the property. Therefore, small details could not be picked up. What was highlighted however was the property was in a very unclean state (mouldy showers, hair in bathroom plugs, gas hob ignition hindered by the amount of build up around cook plates, marks on walls in bedrooms) and there was no commitment to have it professionally cleaned by the owners. When we communicated our shock and disappointment (especially after paying $60K over the asking price), Mitch told us we were being rude and then reverted to policy i.e. "the owners have no legal obligation to clean the property". True colours shown.... We were also told by Mitch that he didn't have a full set of keys from the owners at the pre-settlement inspection and that all would be handed over after settlement. Our representative picked up the keys from Mitch after settlement had completed and found that there were no keys for the door from the kitchen into the garage. The garage was open in one section which meant we had no way of securing our property (and being able to access it from the outside again). Lack of detail on his behalf which meant we had to get the lock replaced quickly at cost to us. Overall, it was an emotional transaction when it didn't need to be.