viasat Lied during a sales pitch and then won't provide adequate speed Seattle Washington

I was occassionally having problems watching NETFLIX with centurylink who consistently provided 1.3 MB/S.  Viasat representatives told me that my plan would provide 12G of data and after that, speeds would decrease to 3 - 5 MB/S.  I signed up for it since the worst speed was twice what centurylink provides.  Viasat has been unable to provide this speed during the later afternoon and evenings.  It consistently provided .1 MB/S (yes, that's .1 not 1) making them unable to provide what their sales representative state.  They have given me credits, increase data (I have to spend an hour arguing with "customer service" before they will add data always saying "this is the last time") but won't let me out of the contract.