hi manish be confident when you talk to buyers such as pappuaji
never show that you have a weakness. do learn all the rules and how ebay works. be a step ahead and keep all documents ready as al-dukkan-the-shop told you.
keep the proof of delivery (POD) ready.
which courier did you use?
these kind of buyers usually target new sellers due to their inadequate knowledge and by the time they learn, they would have lost the entire thing.
if you have communicated with that buyer through ebay messaging system, show all those messages to ebay and tell them this buyer is involved in feedback extortion and manipulation.
BE STRONG AND HOLD ON MY FRIEND:-)
KEEP US UPDATED.