Problems with Tesco Arc110 cordless phone, help?

So I have had Tesco ARC110 cordless phone for over a year, yesterday morning at around 8am the phone started ringing. It woke me up, and I tried to answer. The screen was faded because the battery was low. I put it on charge, and the phone started ringing every 10mins but I was unable to answer. I put it down to the battery and I went back to sleep. I left it on charge for hours and tried to make a call last night but when I press the main button it just beeps and won't let me dial out or answer any calls. I have tried taking the batteries out and switching it off at the plug but it wont work. I don't have the manual anymore and I don't know what to do.