What has gone wrong?

[blue eyes]

I have brewed a Black Rock Export Pilsener kit,which has been bottled now for 3 weeks.
I brewed it in a bin and kept it at temperature with a brew belt.After the recommended days to ferment passed I took a reading over 3 days and it was a constant 1000 on the hydrometer which the instructions said was right.
I then purchased 1 litre bottles from my local home brew shop and added 1 tsp of sugar to each bottle.The beer was then syphoned into each one and agitated to mix the sugar around well.
They were then transfered to the spare bedroom and have been kept there ever since without being touched.
Last night I had a look at one of the bottles to see what the results were.
When I removed the cap there was no fizz and the lager is totally flat.It isnt a golden colour like lager should be,more of a deeper colour,and it is quite malty in taste.In other words,nothing like what a pilsener should be.
I do not understand where I have gone wrong?
I can remember over 30 years ago,my dad brewed Geordie and John Caxton beers and kept them in the airing cupboard in Corona pop bottles,and the head on them was amazing,just like off the tap.All these years on and mine is useless.
Can anyone tell me what I have done wrong and what to do next time,and if there is a way I can save the 30 bottles I have got?
Please,please help!

[Beer O'Clock]

Leave alone. Keep them in a cool place for another few weeks then try one again.
Some lager styles take a bit more time to carbonate.