I'm having problem with my Set top box not tuning all channels of my package


I have big problem with my DISHTV set top box i recently bought and charged with world pack i suppose to get 215 channels but only 101 channels are coming first day i able to tune all channels and watch. from next day only 101 channels are coming i have done lots of things but not working i remove card and put again and i check my signal strength it's 77% and signal quality is 67% when i contacted customer care they said some trouble shooting needs to be done can any body tell me what troubleshooting i can do for my dishtv set top box brand name is arion. what is the reason why i'm not getting all channels? can anybody help me to tune all channels.