Communication

Good day

Really only way to get assistance as emails dont get rep****. On the 23rd I send through invoice for February tutoring and paid invoice for January. Today is the 3rd tutor has not been paid for this month. Send the same email through on the 24th still no reply. I asked for proof of payment for school fees nothing. Email send just to get some information well no reply. All i want to know is which day must invoices be submitted for payment to be recieved atleast by the 1st of each month.