LyingI have a buyer who claims she her item hasn't arrived when i know she has it

I sold an itemt to a lady who claims it hasn't arrived when it has. ive checked on the royal mail trackign website and her parcel was delivered 2 days after i sent it. She's opened a request but i cant get a call back from ebyay. People like her gives ebay a bad name. please help 

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If only tracking was 100% reliable.  Your accusation of your buyer been a liar is extremely serious....The tracking only shows the item was delivered..It does not say who to,at what address, and if it was put in a safe place...These are all things you don't know...And as a point of interest you as a seller have a legal obligation to prove the item was delivered to the actual buyer.  If the item was delivered to a neighbour or left in a safe place and subsequently stolen you are liable.