Spamming and Griefing from JDAWG1123

I have been Griefed by JDAWG1123. I thought he was my friend but clearly not as i gave him a power bow, super slasher and enchanted diamond gear. He said " I will trade you £10000 for your diamond armour." So I gave him the armour. Then he took the armour and didnt even give me the money. Then he kicked me from his island and started calling me a baby. Can someone please help me with my situation and please help me get my armour back.

Also I am reporting him for spamming the message "You have been kicked from JDAWG1123s island" about 20 times and it was really annoying me!!!!!!!!!!!!!!!!

Thank you
MasterTiger101