I had the same problem. I discovered that the batteries were dead, in fact missing from the base, I replaced these. I then used the "Assistant" button and went to settings and changed the ring tone.
Whether it was the first or the second action that solved it or both actions together my Easicom phone is now working fine.
As to Jeremy chucking stuff in landfill that should always be the last resort, our planet is stuffed with waste already :>(
daphne still dancing, February 2018