I encountered some problems with Lee Garden Maid Agency 3 years back. They could not produced the maid we chose and kept asking us to get replacement from their transfer maids which we didn't want to. In the end, they did not give us back the refund and one staff even threatened us with some small and light prints at the back of the even agreement.
We went to CASE, but it was useless. CASE only sent letter on our behalf but couldn't close the case for us. Made us pay membership fee and another fee.
Eventually, went to Small Claims Tribunal. At least got some $$ back.
you can try if you have a small case, I think you need to pay only $15 to reg. The price then.