Who do I contact if I submit a request for support on a theme but get no response from the developer

I have recently bought an Shopify template downloaded it and there are parts missing that should be there contacted the developer for support and was guided to a Kayko account have left two questions but no response. Have searched the site and there are few questions dated 2 years ago answered. Who do I contact in this instance?

please give them time to get back to you with answer of your questions. hope they will reply you soon.