Placed on hold

I phone AutoZone Epping and ask to put me through to Spares, call returns back to reception probably 8 times. Eventually a salesman picks up and immediately tells me to hold on - he does not even know if there issomeone on the other end of the line. Then I am placed on hold for another 5 minutes for them to finish with whatever they are busy with. Why do you pick up the phone in the first place if you can't help the person on the other end of the line? And when I tell him it is poor service to do that I still get an attitude.