Fault not fixed - what's an acceptable outcome?

[kiethton]

Just to get a few opinions on "reasonableness" a little help would be appreciated before I take it up with the garage in the morning, they're good guys who have done a lot of work (£2.8k worth on a £4k car) in the last 3 months.

Facts summarised below:

Garage - Marque specialist
Fault - Intermittent battery drain
Time Period - Had car for investigation for 1 week and another week to fit parts and service, collected less than 2 weeks ago/200 miles
Car - 10y.o barge

After testing battery and other known weak spots diagnosed alternator, fitted replacement etc. final bill <£1k

Car has died again - battery drain

I now think that the alternator wasn't the cause (RAC confirmed it was ok when i had them called out) but garage said it was after testing etc.
With the time it's obviously not possible to fit my old one as its likely been sent off for reconditioning/binned
Paid on a CC so have that backstop

Ideally the new part will be faulty and they can swap it over but it did come back with a PDC fault (not there previously) and is a known weak spot for battery drains I fore-warned them of.

So as per the question, what's a reasonable outcome?

[kiethton]

It was £800 for this job inc. oil service, expensive as its a water cooled alternator

What's the normal procedure where a garage has done work that was incorrect?

[kiethton]

Thanks, spoke to them this morning, as it was over a longer time it seems like it was a smaller drain my thinking was the phone module, but the ignition is a fair shout - battery was fitted OEM 12 months ago

Going to disconnect the thing this weekend and go from there

[kiethton]

Well I've got no further, after previously taking about 10 days before not starting its now instantaneous - it'll only start with a jump, even in an off and on scenario, however after sitting idle for 2 weeks there is still charge (security light still flashes).

An I right to think that it's just a duff battery?