Hi StanelyNTL,
Your power level is a little low at -9 but your modem may well be coping at this level ok. Are you having specific connection problems? Loosing sync/rdy lights on your modem? If not and all is working ok then don't worry about it, if it is causing problems then ring technical support again to request an engineer.
Gary
P.s It's quiet this morning is everyone watching the royalwedding or something?