Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
So you have a "main base" station, and 3 cordless handsets that you purchased, correct?
Okay, that main base station must be plugged in to both power and the phone line.The wall charger/power plug for the main unit may be larger than the one for the other 2 satellite charger stations, so you do have to have that connected to the main base unit.
Can you check that for me please?
I sent you an answer above, this is a conversation and you'll need to attempt what I suggested and reply back to continue.