first, i didn't think you have describe your problem in detail, you just complain your miner is full of dust and donot hashing on advertised rate
can you show us one or two picture about the dust and what is the hash rate you get?
also you said our host miner have many problem recently, i don't know what kind of information support your words, most of my customer are very happy with my service, according to my  statistics，the offline time for most of the host miner are less than 7.2 hours as i promised, and every offline time exceed 7.2 hours are compensated, almost all of the host miner running at expected hash rate.
besides that, i have adjusted the host fee for more than 50$ on our professional data center and provide simple data center with the host fee as low as 110$(need 25 unit).
i have done everything i can do to provide good service and i admit that there is some problem together with miners, but i am not the person who produce them, sometimes, the thing just out of my controll