Ebay.in — order no 0865321 uni c returned no refund

Address:	500017
Website:	Ebay

Order no 0865321. The uni c tablet was returned to ebay on 7th sept 2017.
The pick up receipt no is[protected]. Order id 3119615.
Signed bt siva kumar. Pjone no; [protected].

Just called ebay they refuse to accept this information although i have a signed receipt of returned the item.
The ebay person harps on the fact that my email id is not recognized. (I had to change my mail id because it was hacked into and all virus got in).
Then again the ebay person says that i ordered the same item in january 2018 which is true, i wanted ebay to jog their memory for the earlier scam, but no. The ebay people despite being given order numbers pick id number refuses to recognize it!
It's funny how this monster blood sucking hound, got away on a technicality.
What should i do? Just forget about it?