Did you have a written contract concerning the grading work, and did you sign off on it as being satisfactory? If so, you approved the work as is and you're out of luck. Sorry.
I know this won't help you now, but one of the first things I looked at before purchasing my property was how well it drained. Drainage is one of the most important aspects when you buy property, especially if you plan to put horses on it.
I first saw my place in the middle of a sleet/snow storm, and it had been raining quite a bit in the days prior to my visit. The fact that the land had no real standing water despite the vast amounts of it coming down out of the sky, made me want it immediately.
My barn and stalls do not flood, as they're placed slightly uphill with the house. My front paddock floods on occasion, but it drains very quickly because of the soil/rock composition of the property.
Clay based land shouldn't be that unstable, but it does present drainage issues. Water unable to drain properly causes erosion issues, which is why you're thinking your land is unstable.
I know this won't help you now, but one of the first things I looked at before purchasing my property was how well it drained. Drainage is one of the most important aspects when you buy property, especially if you plan to put horses on it.
I first saw my place in the middle of a sleet/snow storm, and it had been raining quite a bit in the days prior to my visit. The fact that the land had no real standing water despite the vast amounts of it coming down out of the sky, made me want it immediately.
My barn and stalls do not flood, as they're placed slightly uphill with the house. My front paddock floods on occasion, but it drains very quickly because of the soil/rock composition of the property.
Clay based land shouldn't be that unstable, but it does present drainage issues. Water unable to drain properly causes erosion issues, which is why you're thinking your land is unstable.