Poor service delivery and false asvertising

Please dont use your December salary that you received earlier to purchase Christmas presents through Payjustnow. They advertise 3 monthly installments but want to take the 1st payment now as usual and also take the 2nd payment on 31 December which is not a month later. False advertising as that is not monthly installments but weekly!!! And they dont want to move the payment to January when requested so that it can be paid with the next salary.