make sure that the lnb is completely pushed into the Y-adapter, if the dish feels like it is really tight on the pole that could very well be the problem.. the LNB shouldnt be loose at all...
and as far as service goes... if you call a nationwide 1-800 number, they have to put in the work order, and then they have to send it to the local retailer, DNSC, ect, then they give them a day or two to accept the work order, if they are too busy, or cant get to it, they reject it and send it to the next retailer... so they have to schedule the installs a fews days in advance to give themselves time to get someone scheduled to do the work.
if you call the local cable company, you are usually talking to a local company that knows what they have for the next day or two. Same if you call a local retailer, they should be able to get out in a day or two.