The calls from this number is harrasment!!

afternoon call, no message left

Call back gets, "Thank you for calling.........(can't understand this part).  Our company raises money for many worthy charities.."  So it's a telemarketer turned charity collector.  These for-profit (huge profits) companies make money by keeping the lions share of what they collect.  Here's some information on charity telemarketing:
https://www.thebalance.com/prevent-charity-telemarketer-scams-2501916
https://nonprofitquarterly.org/2013/06/07/ame ... -telemarketers/

It's a scam.. I politely said no thanks and they hung up on me..

Received call, did not answer, they did not leave a message, blocked number.