Hello,
First, you have to update HikaShop and HikaMarket to the latest version.
It will also remove your modifications in the core file and restore a working version of HikaMarket vendor dashboard.
Afterwards, you can use the "contact us" form in our website to get a quote regarding your need of custom plugin.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.