Hi Ricky,
If you did the full removal of the device, you will have to do the following two steps to get it back to the state it was in.
1. First perform the technical reversal of the removal using EG50.
2. Perform the billing related installation using EG34. (Use the same date it was removed on).
This will complete the reversal of the removal restoring the time slices.
Regards,
Monis Shakeel