Just had a plumber to our house to help with a toilet that overflows when other water in the house is being used in excess. He snaked it said it was closed and could not get through, used a camera to see and said he could not see because of the water, he then told us to go to the side of the house where there is a low spot in the yard because the problem is there and to start digging to fix it then left...ummm any ideas? Currently my husband is digging to look for water or pipes but I am left feeling super uneasy?