dell xps 14 wifi issue

So I bought my original laptop from dell at end of april. Was giving me terrible wifi download speeds. My 3 year old dell laptop was giving me at least 4/5 times the speed. After 4 months of tech support and multiple technician visits a replacement was offered. Lo and behold it had the same issues. Again after 2 months of tech support technician visits etc etc with no workable fix again I have been offered a replacement. Frankly at this point if I could just return the replacement for a refund I would.  Do I have any options here or do I have to hope and pray the 2nd replacement will actually work? I have read in numerous forums that Dell have known about this issue for a while. This is not good enough and I have spent the better part of 7 months dealing with this...