Welcome!
I'm sorry you are having trouble getting in contact with breeders. Some of them aren't great at communication but luckily most are! This isn't the best time of year to start looking as most puppies are spoken for. Most basenjis in the USA are born October-January so your best bet is to get on a waiting list. Are you willing to travel? I don't know any breeders in MA.. I live in the Midwest and know many breeders but that might be a bit far. My dogs are from KY and MO.
It's been a long time since I've done the breeder hunt (I'm happy with who I've used for the past 15 years!). I remember I emailed EVERYONE I could find until I got responses. I made sure the breeders health tested their dogs (we have far better tests now!), had titles on their dogs and seemed to be in good standing with the BCOA. Now a days Facebook seems to be a good route to contact people. Breeders are friends with other breeders and if someone you contact doesn't have a puppy for you they might know someone who does! This is actually how I got my first dog. I was referred by one breeder to another.
Never settle for less than the best! There are a lot of BYB out there who might have pups all the time but PLEASE make sure to check them out with OFA and see if they are a BCOA member.