1. You have misunderstood the concepts of "paid back" and "minimum repayment amount". Repayment refers to the amount that you have repaid before the bill date, that is, the amount that has been deducted. Suppose you spent 54,000 yuan on the bill in June and repaid 4,000 yuan before the bill date, then this 4,000 yuan has been deducted as the repayment of 54,000 yuan, then your actual bill amount in June is 54,000-4,000 = 50,000, and your minimum repayment amount in June is 5,000 yuan.

2. So you have to pay back 5000 yuan before the 7th of the next month, not 1000 yuan. Unless you pay back 4000 yuan after 17, then you will pay back 1000 yuan.

3. If the above inference is correct, then after you return the minimum 5000 yuan, the bill for next month assumes that you have no other consumption, so the amount should be 50000-5000=45000+ cyclic interest, and the minimum repayment amount for next month is calculated according to this result.

If there is anything unclear, you can ask me again.