I have contracts with them and as of last week I got the same experience. For weeks my contracts worked pretty well (although hasrates were very unstable) however as of last week it appears as if they have shut down the mining on external pools entirely. I have tried several different pools but no luck anywhere. It just doesn't make any sense that settings that used to work for weeks suddenly just stopped working. Their support is indeed unhelpfull and only tells you to point your contracts to their own pools. Honestly their support seems absolutly clueless about mining.