Fortunately, I've got a response from the user after 3 days since I contacted him in Telegram. He asked for an extension for up to 3 weeks on which I allow.
Anyways, share ko lang din, during the time na di sya nag-response kahit na-seen niya message ko, I raised my concern in coins.ph if where can I contact the user and they assist me. After exchanging several messages, I'm now on the step wherein I will fill-up now the official complaint form. I decided not to do that for now since nag-reply naman na si borrower.
Honestly, I don't mind the amount since karma na ng tao if di sila magbayad and magpakilala sa small amount. Tinest ko lang if matutulungan ako ni coins.ph kaya coins.ph BTC address ang hinihingi ko para puwede ma-trace just in case. Actually di ito basta-basta since it's all about privacy kaya may mga hiningi silang proofs and dapat malinaw. Magaling sila mag-handle. So in here, puwede pala ma-trace and may chance basta matibay ang evidence.