It is generally understood that m is short for the number of repayment months. The time period referred to in M 1 is "from the second billing date that has not been repaid to the last repayment date of the second bill". During this period, the bank will take the form of collection, impose penalty interest on the unpaid loans and collect late fees.
M2 refers to the time period "from the date of the third bill that has not been repaid to the last repayment date of the third bill". In the meantime, the bank collector will call to tell the consequences of non-repayment. If necessary, we will contact the debtor's relatives and friends to help him repay the loan.
M3 refers to the time period "from the fourth outstanding bill date to the last repayment date of the fourth bill". During this period, the bank will take compulsory repayment, and the collection staff will ask the debtor to repay by telephone, text message, lawyer's letter, etc.