Think about where you want your advert to appear in the paper, is it currently under a heading eg: cleaning services or is it in miscellaneous, if you were looking for a cleaning service where abouts in the paper would you turn to without having to trawl through it all? A domestic cleaning ad can do quite well on the television pages as this is usually the page left open!
Has this ad run for the full 13 weeks? I am surprised you have had no response, this type of advertising is usually pretty good for the domestic sector, but as Paul says maybe it's just the time of year.
I would give the paper a call and tell them you have had no response, let them know that you would be keen to try again but that you can't keep paying their price, also explain that if you could get this to work you would look at advertising with them on a longer term and possibly advertise in supplements, hopefully you will get a good discount.
Fox