Why I cant use the data quota that I've bought previously?

Try following these steps:

1. Try to check whether your gadget gets a signal or not
2. Try to check whether the phone settings in your gadget have been set to the by.U (Telkomsel) network or not.
3. Try turning ON and OFF Airplane Mode on your gadget alternately
4. Try opening your by.U application, go the dashboard, and check whether you have the credit/phone quota or not :(
5. Still can't? It looks like you have to contact Nindy via Live Chat

Please include below information to ease us track your complaint:

1. Write your complaint
2. Print screen the dashboard of your by.U application
3. Time and duration of the incident
4. Network type that appear on your gadget (2G/EDGE/3G/HSDPA/4G/LTE)
5. Speedtest screen shoot
6. Apps/web that you can't access
7. Inform another number of yours that Nindy could contact

If you've send all the data, we'll process the complaint and will get back to you soon to follow up your problem :)