recivied the same call but missied it for some reason tried calling back but get disconnected hmm

This company attempts to ring all day, will hang up on you when you answer the call, then repeat this for a number of times. When you ring the number back it says that you have missed a call from a company that works for a reputable charity and is contracted to make phone calls and that they will contact you soon. You can not leave a message. Other times you are given a error in connection  .