Call center unable to help with a payment arrangement

I've been trying now for the past week to make a payment arrangement on my over due amount but you guys are making a difficult every time I call the call center they telling me they logging a case to make a payment arrangement I get a case number SMS to me then I never get a phone call back to make the payment arrangement the case just gets closed so now what must I do cell c please contact me to Make payment arrangement as I do not want my line to be suspended I'm available anytime after 1 in day my contract number is ***