Background: Companies delivers lots of things, one of which is some alarm
cable. Company send wrong cable. Company still hasn't realised two months
on. Company have been utter *******s about other issues - me selling alarm
cable. This company has messed me round so much, that I've no moral
problems selling it. (so spare any lectures folks!)

I *had* ordered 100 metres of 4 core alarm cable

What arrived was 8 core, and in a drum. I'm told by the alarm installer that
it's between 1km and a mile in length.

I just weighed the drum and cable, and it's 17kg. There are no labels on the
drum. The drum is plastic

I can find new prices for this cable from the company's (see above) website.
what i need to know is
- based on weight, how much cable is there likely to be?
- how much is the resale value, if anything?