We received a call today from 415-615-0784, caller id-United Supply.  They asked if we sell _______ chargers. We did not understand the word before chargers and asked her to repeat it.  She said that if we didn't understand the word then we must not sell it and she hung up.  We googled United Supply and came to this web site for unwanted calls.  We tried to call them back (from the caller id) and immediately after answering their phone they asked if we were calling because we had a missed call.  When we explained the earlier call, he hung up.