How can I send a text message to the debtor if I don't answer the phone?

I drafted a template for your reference:

The call to you was not connected. How much money did you borrow at a certain time and when did you promise to pay it back? How long has it been overdue? I still haven't received the repayment. As a friend, interest will not be charged to you, but you need to confirm how long it will take to pay off the debt. If it is overdue again, can I pay by XXX? If not, with what to pay.