N/A

I checked on other threads. It seems like it is impossible to add credits because this is usage based plan?

Should I refund it and do I need to start a new account?

we do not support new sign ups on the pre-paid plan, so i can not advise you try that as you would not be able to sign back up with pre-paid

Is there any way I can use the pre paid plan?

By new sign ups, does this mean it is no longer possible to do so?

that's correct, is it no longer possible

!s