Would I be wasting my time with small claims?

cossagepie

I had a bathroom fitted less than a year ago and soon after had some problems with the cistern. The installers at first were responsive but after a couple of attempts at rectifying the problem and realising it wasn't an easy fix became more and more difficult to get in contact with. The problem was eventually repaired by the cistern manufacturers own service guy.
I am now having problems with the cistern and also the sink tap. I contacted the original installers and they took my first phone call and said they'd be up within the week. That was a month ago and since then they are ignoring my calls. I've been told I can make a claim in the small claims court under the Sale of Goods and Supply of Services Act, 1980. So my questions are:

1 Can I?

2 How would I go about this? I need my bathroom functional so do I have another plumber carry out the repairs and then look for reimbursement from the original installers? Do I leave the bathroom as it is and wait for the outcome of the case before doing anything?

3 How do I put a cost on the repair if I can't have it repaired before the claim? A claim amount has to be put on the application form.

I know this claim will not be for a large amount but I would pursue it purely because I think I have received terrible after sales service and to let these guys see that they can't get away with treating their customers like that. Alternatively should I just pay to get it sorted and move on?
Any help or advise would be appreciated.