I'm sorry you had trouble with the phone agents and feel that the service call is too lengthy. Sometimes we are limited by the number of service centers in any particular region.
I'd have recommended not canceling the service call. In some cases, the technician may know what's wrong and be able to address the issue. However, you do have a warranty (and if you register online, you also qualify for an additional 3 months on top of that) in case the issue appears again.
People post their service tickets online, often times even here in the forums. Most of the verifications are in place to make sure that we're talking to the right person.
Samsung LED 40 inch Series 6300 TV purchased 38 days ago. Last night while I was nowhere near the remote or the TV, it suddenly went up to maximum volume. Using remote I could reduce volume but as soon as I took my finger off the "down volume" it would shoot up to maximum again. Remote would not turn TV off. Mute did not work. Unplugged TV, waited, plugged it in, same thing happened immediately(3 times I tried this). Samsung support had horrible language skills but ultimately 24 hours later I arranged a service call (first available in 6 days - ridiculous). Today I plugged in TV and it worked normally. Cancelled service call but am very nervous that there is a glitch that is going to keep causing this problem out of the blue. Why would this happen? Did I get a lemon? And why do Samsung customer support people have language problems and make customers repeat information when there is a "ticket number" that should allow them to access the record of the previous conversation?