Yes, you can obtain a debt clearance plan for your adjustment bill via your Customer Account or, on request, fromour Customer Service department . You can choose the number of monthly payments, as long as this does not overlap with the next adjustment bill.
However, it is not possible to pay your instalment bills in several monthly payments. You can, though, change the frequency to monthly rather than quarterly. By paying your instalments monthly instead of quarterly, they will be lower, which will allow you to spread out the burden of the bill on your household budget more comfortably.