Next time, if you already had a better offer, please at least let me know before I release the quotations. By telling me that you are selling the parts to someone else AFTER i have given the quotations, you are making me lose goodwill.

And it wasn't like I had broke any part of the agreement. You had specified a price range and I had sticked to within the price range.

I won't be so kind the next time to offer help to such people in future because they are unrealiable and having them as suppliers will only result in loss of goodwill from the customers.