Problems with woolies avocados

Something is wrong with woolies avocados. I bought a pack of 5 for R86,99. A few minutes or seconds after cutting one avocado for breakfast, it turned brownish (black spotting). I had to return the pack to the store. Such an inconvenience! Not sure if Woolworths has changed its supplier or what, but those avocados are not of good quality. Especially for that price!