Extremely disappointed and dissatisfied

Extremely disappointed and dissatisfied. Been emailing their support centre since Monday 22nd January. Informing them that I started a new job on the 2 January, and urgently needed to change my debit order date to the 1st of the month as there would be no funds if debited on the 25th. Recieved a reference number every time. Over 9 in total since Monday. Not 1 email back or phone call. Even though I said in every email it's a matter of extreme urgency. But yet I get a notification today that payment is due. When I eventually got a phone call answered I get told that I have to pay today. And then only can I call and request debit order date to be changed. I am beyond furious. I am working from home for an overseas company