866-410-0572

keeps on calling. says it is from March of Dimes

March of Dimes Foundation uses the fundraiser Infocision Inc.see https://www.sos.wa.gov/charities/search_detail_cfr.aspx?cfr_id=66 They can call as any portion of their campaign that includes other names used:
Bikers For Babies
Blue Jeans For Babies
Jail & Bail
March For Babies
March Of Dimes Birth Defects Foundation
Mothers March
Reading Champions
Teen & College Action Programs
Walk America
Walk-a-Thons
ref: https://www.sos.wa.gov/charities/search_detail.aspx?charity_id=2835
If you're a Florida resident receiving unwanted, abusive, deceptive calls you have the right to demand placement on their "internal do not call list" under Florida do not call policies see https://www.fldnc.com/About.aspx
Florida gift givers guide also shows additional fundraisers used by the March of Dimes Solicitors:
Bkv, Inc -- Atlanta, Ga
Infocision, Inc. -- Akron, Oh
Thompson, Habib & Denison, Inc. -- Lexington, Ma ref: https://csapp.800helpfla.com/cspublicapp/giftgiversquery/giftgiversquery.aspx
Make complaint and demand for placement on their Internal do not call lists here https://csapp.800helpfla.com/CSPublicApp/BusinessSearch/BusinessSearch.aspx all others look at rights under FTC do not call, paid fundraisers, and internal do not call requests.

They call here once sometimes twice daily. I don`t answer the phone. The other day I did pick up the receiver and said nothing, just listened. A few minuets later got a busy signal, then hung up.

TOLL FREE CALL. No message left.

This a very persistent number.  They call several times a day

Whoever is calling identifying themselves as "March of Dimes" cycles through these 5 different phone numbers, at least in my experience.
I have gotten multiple calls from each of these numbers all within the last two weeks.
866-410-0458
866-410-0459
866-410-0461
866-410-0572
914-294-5465

So you can get ahead of the game and block all five now.