I had a similar incident with the same company with a drill I bought from them, it would not hold a charge with either of the 2 batteries, I was asked to leave it to be tested and they would call me, after 3 days when they had not I rang and they said they could not test it as it seemed to have an electrical fault and they could not test because of H&S. At that point I asked if they sold emery paper? The guys seemed surprised and said yes of course....I then advised him to get some sheets and rub all the rough and sharp edges off the drill......silence......then he spluttered and asked 'why?'...so I informed him I would be calling round the next day to shove it up his ****.
2 hours later they rang me and said a new drill was ready for collection. After going to get it I have never darkened their door again.