Annoyed- billing issue!!!!

My voda account reached the end of its contract a few months ago. I am living in UK currently, so wanted to cancel it for now and restart when I return. Hard for me to manage my SA accounts from UK, I didn't leave enough money in account for last payment. Voda tried to take and a charge was added. Then got mail saying I will be handed over. I responded and asked that the final payment be split over 2 months. Voda agreed but it doesn't look like those payments were taken. I want to try and sort this out now and voda CS wont help as they say its been handed over. I am really angry now. I have been a client for over 10 years and always paid on time. Why didnt you take the split payments and then hand me over due to non-payment???? This is against our agreement and if not resolved I will take to ombudsman. I dont care you cant see my profile anymore, I am not dealing with a law firm and paying charges. this is between you and me!!!