It sounds like someone is spoofing your phone number. These are usually scam calls and it is recommended you do not pick them up.
You can find a few write-ups on this here:
https://www.ag.state.mn.us/consumer/publications/CallsFromYourOwnPhone.asp
https://www.consumer.ftc.gov/blog/2015/07/getting-calls-your-own-number
Hope that helps!