I'd let it go also, life's too short. Though it would be refreshing for a company to just send what they advertised and sort out their listing error...unless they had lots and lots of order on the basis of that error.
Keen film/camera hunters like us pick lots of bargains from what I can tell by these various threads. I paid 6.99 GBP + 3.99 P&P for an expired 35mm ORWO Chrom UT18 film (pricey, but it's important to treat myself to something unfamiliar, or at least that's my excuse), then won 3 Ilfocolor 100 Plus films for 0.99GBP + 3.50 P&P. Can't wait to use them!