based on your info, you've already paid your 12th instalment last month (May). So you should cancel it after 7 June. then you apply again this month and it'll be counted for next month's interest.Look at my earlier post again. I elaborated a little.
that's how I intrepret it.
May (12th payment) -> counted for June -> paid out on 7 July
June (new 1st payment) -> counted for July -> paid out on 7 August
I guess need the oldies who've run a full cycle to confirm... I'm not yet at one full cycle.
