This number calls several times a day but does not leave a message.  I tried to call back, but no answer.

I have been getting calls from this number at least twice a day and they do not leave a message.

I have been receiving multiple calls a day from this number, but no messages left.

Just got a call from them also, went to voicemail where they said nothing.

Call from this number, went to voice mail and they didn't say anything.