I had the plan of 1.5 GB data and free calls within Germany. The plan was to end on 1st December, 2018. However the data limit was exhausted and so I wanted to do another recharge of the same plan. But since it was on 30th November, 2018 (before the expiry date) I could not proceed with the same plan. Instead I recharged a Data Pack of 2GB with 9.99 Euros. However, I do not like the call 1.5 GB plan. I have used 0 MB of the new Data pack (2 GB) and want to discontinue with this plan and reimburse my original plan of 1.5 GB and free phone calls.
Please let me know how to deactivate the data pack of 2GB so that I can get the balance of 9.99 euros back and recharge my original plan instead.