As advised, You can submit a ticket to support here: https://www.fiverr.com/support_tickets
By the way, in the past few days Etsy sellers have been getting "spam texts" which come in a way like it's from Etsy officials which you stated, " so-called customer who wanted to buy my t-shirts, the message included a link to supposedly validate my account with my bank card." These are new scammers, be aware of them! Searching on YouTube with the keyword "Etsy officials spam texts scam(or something similar)" you will find plenty of resources to learn from about the security of your shop. Hope things get easier for you, Wish you good luck boss!