Who called from 2104053717

Received a call from this number on my business phone. Rang twice, answered, they rang off.

called - no VM. must be sales call

They call everyday and no one is on the other end.

Called in the evening. Hung up after three rings. Blocked.

Called with cid "customer svc" but left no message - this is a voip phone call from San Antonia Texas and since I get many calls from this area code I am thinking it is not a legit but probably a scammer call.