Incorrect debit order date on agreement,cant get hold of Fasta they keep closing my tickets

My debit order date was loaded,incorrectly,i get paid last day of the month as per my bank statement and payslip.however there is no number or email address to contact Fasta.their support option on the website just closes my calls without assisting or dealing with my query.the watsapp number is a robot responding to you.I've had more that 5 tickets closed by these bots giving me generic responses and not resolving my query.i need them to call me,give me a number or something but a person needs to fix this error as i did not choose the 25th,i do not get paid on the 25th.