Could be because you're answering, they tend to continuing to call those who answer. Try not answering in any way or blocking the number if you're able to. After a while, they will possibly give up.
I had been getting calls from this number for weeks. It appears under a private name but claims something about warranties. At the beginning of the call the guy acted like he knew about my vehicles but then started asking questions (that I didn't answer). My assumption is that this is some person (or people) that makes a big introductory but in the end will ask for you social security number and steal your identity. I may be wrong but I wouldn't trust them to give out any of your information. The guy just hung up on me because I wouldn't give him my information. Just seems fishy...
Calls about getting a vehicle warranty, but the vehicles they mention I no longer own! Haha they call sometimes three times a day and have been for weeks. This is even after I say take me off your call list!! Don't waste your time answering!