Generally speaking, if it is overdue for more than 4 months and the debt is nearly 40,000 yuan, it is unlikely that the bank will only charge the principal without interest. According to the regulations, after a certain period of time, the bank has the right to submit it to the judicial department for criminal responsibility.
It is suggested that before negotiation, part of the quota should be repaid according to the minimum repayment amount. If you use a credit card, you can only use the minimum repayment amount as a last resort, and try to repay it in full or in installments.
Since it has caused the present situation, don't say anything. Find the outlet of China Merchants Bank and communicate face to face. Generally, the third party entrusted by the bank has no right to give you a grace period, and they will only harass you endlessly to achieve the purpose of dunning.
So, don't delay, find the credit card manager of China Merchants Bank outlets to understand the situation and negotiate a solution.