My Merge Boss Credits Disappeared Worth $5

I accumulated credits worth $5 in the Merge Boss game. There are specific times to convert them, and I waited until May 11th. However, when May 11th arrived, my credit conversion button was disabled. I deleted the app, reinstalled it, but the issue persisted. I tried from another device, yet no luck. The problem remains unresolved. I contacted customer representatives, and they acknowledged my email. They sent an email saying 'Wait.' I waited for 2 weeks, but my credits became unusable. There's still no solution. It's incomprehensible for such a large platform to encounter such an issue.