My phone is indicating 'line-in-use', and I can't go back to getting a dial tone. I'm worried its chalking up a big bill. Can you check whether the line is in use or not, and release it if it is? My number is [Removed number]
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I'd like to welcome you to the forums and say that I'm really sorry to hear that you're experiencing an issue with your phone line at the moment.
I've run some testing from this end, and it does not show that the phone is in use at the moment, so hopefully all is now working fine your end, and you've got your dial tone back. I can not see any evidence of a local fault, so it may have been that the person that you called did not put the line down correctly. After a while the line will release itself.
Should you still be having an issue with the phone line, I'd have to ask you to disconnect the phone from the line, and if possible try another phone on the line, just to eliminate your phone from being at fault.