You may not hear from them if you have thwarted their plan 🙂  I often find if a buyer is angling for a discounted/free item without a genuine reason that once I indicate it will be a return for a full refund they either suddenly decide the problem isn't a problem or go quiet.  I've had a couple of buyers try 'the lights are a different colour' unfortunately for them in both cases the particular lights weren't ever made in the colour they claimed they received!  One buyer suddenly loved the unexpected 'manufacturing error' colour, the other went silent.