Airtel — call from +4044 and +3444

Address:

Anantapur, Andhra Pradesh, 515001

I am a airtel user and today at about 13.50 hrs first i received a call from +4044 which i rejected and then received a call from +3444 which also i rejected. I would like to know who is calling with this number, whether it is fake number or not as well as for me there is no relative in abroad at present if it is fake i wish to inform for my friends and relatives and just now 14.10 hrs again i received a call from +3444