Please help me with a payment arrangement

I have been trying to make a payment arrangement on my account but the call center is unable to help me I have a R267 outstanding and I wanted to make a payment arrangement on it as i wanted to pay it on the 1st of January basically I wanted it to go off with my new bill I've been trying to get this arrangement set up because I am scared of getting suspended but call center can't help me please help as this is urgent