It is difficult to determine based on the information you have given. That said, I assume that the buyer / buyers agent / contractor got permission to enter the property from either the seller / sellers agent.
If not then they could be considered to be trespassing.
Would it be grounds to not perform under your contract, I would ask my legal counsel.
If you decided not to proceed with the contract based on this, you could be tied up in court for a long time, with large legal bills.... more
Take any and all feedback to heart that you have gotten from the showings over the 6 month period and make changes accordingly. If there haven't been any showings then it is time to take a look at the price on the home as well as how the home has been marketed.... more
Sounds like you signed up with the #1 or a top producing team in the area.
This is not an uncommon outcome.
Home owners do not often recognize the choice they make when they choose a top producer over the single operator agent who limits the number of clients they take at any one time. There is a very finite number of people that can be helped based on the avaialble time.
Before you throw anyone under the bus, you really, really need to have a meet up with your agent. It time to have that conversation about your expectations. Your agent will then be able to share with you what is really taking place. Most of the real selling acitivity occurs where you can not see it. What you can see. (open house) is mostly irrelevant in getting your home sold. This is not intended to deminish your concern but to place it in the correct perspective to your goal...GETTING YOUR HOME SOLD!.
You may discover that the real selling action will far exceed your expectation and your agent will be able, based on what you truly can not see, advise how to better exploit your homes features now that data is in place to analyze.
Finally, you should feel perfectly comfortable changing agents after you have had your meet up.
No, there has been not breech of contract. Just a breech of trust.