My idea for nitro

So basically, when you have nitro and someone gift you then you accept It then it turns into a credit right? Well,you should be able to cancel your nitro then you should be able to apply the credit,i wanna boost a server and i have normal nitro as credit and nitro classic as the nitro im using,but i wont be able to cancel my nitro to get the normal nitro to boost the server. thats my idea