How to stop DID from getting released or DID billing
Go in to that DID edit and check the billing type.
DID have 3 types of billing
One time
Recurring
Recurring monthly.
You can check billing type in above screenshot.
One time
If you will select one time then it will ask you for the days that for howmany days you want to keep that DID live.
You can check in above screenshot in that you need to select one type and if you have set billing days 10 then after 10 days it will get released from that customer account automatically.
2.Recurring
If you have selected Recurring in billing type and selected 10 days then after 10 days DID will automatically get recurred .
3.Recurring monthly
IF you have selected this DID type then it will not ask you for any date but it will get automatically recurred after the month of purchase.