Helpless When Using Paypal


I am an ebay seller and have had charge backs from buyers claiming they didn't receive my parcels, paypal refunded them even though I provided a proof of postage receipt from royal mail. Paypal claim I have to get a tracking number for each and every parcel I send out, despite the fact that ebay do not allow me to charge enough in postage costs to cover this. Also I sent one of the parcels out after the last christmas post, royal mail claim that it can take up to 20 days to reach europe and an extra 7 days because of the christmas/new year period. Despite this paypal have reversed the transaction without waiting for the expected delivery time to complete! what buyer is going to contact them and say 'my parcel has arrived now' after they already have their money back?
I feel so frustrated and helpless!

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