Terrible bras

Last week I purchased the non wired padded bras from woolworths at a cost of R250. I was happy with the fit and feel of it. I wore the one color of the 2 pack and this morning when I try on the other color I find that it is small to the point where my breasts are spilling out. Immediately I put on the correct fit one ontop of the other and I found the cup to be smaller. I took my measuring tape to measure and found that the one bra cup is 17.5cm while the other is 19cm. How can woolworths even allow this? This is wrong on all counts as I cannot return the bra as one has been worn. I am now stuck with one bra that doesn't fit. This is honestly the worst thing I've ever had to encounter