FloBear, it's not for,us to prove we treated it properly. If the plant is dead, dying or pathetic we simply say we did the right things, produce receipts and expect the warranty to be respected by the vendor. Always ask for the manager too. Top man always best.
Never shout, be angry or be a nuisance. Complain with right on your side without showing any signs of nervousness. .best to show disappointment and expectation too though.
Dont forget our future custom is always wanted