21 High Country 350BH

[Sully406]

I recently posted about a mystery leak that is taking place about once a week located in the area under the bathroom floor which we've tried to locate by taking the panels off from the inside of the pass through area. Now we've got an even bigger issue, we came home on Saturday Sept 19th to a waterfall coming out the entry door of the camper. my wife ran in and found the sink was backfilling through the sink drain. There was no facets running, the toilet was also filled to the point of almost overflowing. I went to the tank drains and pulled all 3 levers and shut the water off. the only water that had been on was our city water connection. We took the unit in to find out what was happening and get it repaired only to be told that they pressurized the system and can't find any leaks. They also told us that there is no possible way that the grey and black tank could both fill like they had done. They basically told us we are lying about what had happened and unless we give them a cc theres nothing more they will do. We have the unit back at our property and are asking for any help in answering this mess. They didn't even try to locate the other leak I had posted about the other day that has yet too be found as well.