I just bought a Hyundai and was told by the dealer to expect a call about th service I received. Probably the best way to handle it would be just to answer once and ask that they don't call back. Most reputable companies will accept that.
If you have had your vehicle serviced by a Hyundai dealership or you own a Hyundai you may be called to complete a customer satisfaction survey. Has happen to me multiple times. Take the short 1-3 question survey and they never call again, until your vehicle is serviced by them.
I also have been receiving these calls but I do think it is Hyundai. I had my car serviced a few weeks ago and they told me I would probably be getting a call about a survey.
If you do not recognize the number, dont answer; if its important the caller will leave a message. Sometimes people who try to steal identities will get a persons information and then call to verify that it is correct, often they hang up as soon as you answer. Sure its annoying, but the only way ive found to get rid of them when I do accidentally answer is by threatening legal action...that always makes them stop/