You either posted by a method qualifying for Paypal seller protection in which case you can successfully defend the chargebacks or you did not in which case you will have to refund the payments and take out civil proceedings against the buyer to try and get your money back.   If you used click & send, registered post, platinum express or eparcel then you are OK.

PJ mentioned Paypal Seller Protection,  PJ if you are around would appreciate if you could answer this one for me ....or anyone else who may know, does Paypal seller protection also cover using Parcel Post Plus Satchels which have a tracking number? Just Wondering?? thanks