You're stringing us along and telling the full story question by question. Your other related question, which contains important information not included here can be found here
If you think the appliance is leaking and it’s new, then arrange warranty service.
If you think the appliance is leaking and it’s used then seek paid appliance service. (choices 1 and 2 are often very different companies. Companies performing factory direct warranty service are usually very expensive for consumers after warranty, in which case your better off to find the local appliance repair guy, or someone that has worked in the industry before.
If you think your plumbing job is leaking, find that with the soapy water test as @isherwood describes in the posted answer to that question.
If you need to decide which to fix/test, close the service valve you installed just before the stove connection and wait to re-sniff.
Most new appliances don’t have a continuous pilot light, however if you have a continuous pilot light that might be the source of the oder. Sometimes cleaning a carbon buildup helps, or strengthening (warming) the pilot. I'm told that that oderant added to the gas doesn't completely burn itself up in a small relatively cool pilot flame, when the burner ignites it typically produces a enough hot flame to completely destroy the oder. (My source for the above was a gas fireplace repair guy, he sold me a new pilot assembly and it did seem to decrease the pilot only oder greatly.)
As far as the appliance service company stating they may not help with the gas line, I don't blame them. They don't know without seeing if it was done professionally to code or if installed in a dodgy fashion. If they miss something and it later catches fire that's on them.
Close the gas valve and decide if it's your gas line. If so, use the soap test until you locate the leak (this is very easy to do). if you need appliance service call the company back instead.