It's more than 36 hours when I sent them text and still no reply. Should I contact their support once again or wait for their response for 1 more day?
36 hours of waiting is still tolerable. Yes, no choice but to extend your patience.
Feel sorry for what happened to you but your case shouldn't be a reason why people should not use Coinbase. Different people have different experience.
Anyways what happens to you is looks like a sort of technical bug.
Crypto exchanges services are useful at some ways. No way I will stop using them just because of OP's case. I need their service. I feel the benefits.
People just have to understand what they are dealing when using a web wallet services. And come on, just used their service and not to act as their wallet.