DIYELECTRONICS.CO.ZA SUX!

I orderd 4000mah cells from them and when i tested them they tested below the 4000mah as advertised, i asked for a refund but they came up with many reasins why they cant , i was told my tester is not correct but i tested a 5000mah cell from micro robotics and it was 5000mah so i dont know how my tester is not correct. they have a dont care attitude