No service Sucks

Got a contract with Vodacom in November 2016. They have been debiting me since, every month then all of a sudden a few months ago they cut all the phones and told me I owed them I then made arrangements to pay it off, I have been paying it but they still keep on switching the phones off. They cannot help me when I go into a Vodacom shop and they have since advised that I should go to Vodaworld head office in Midrand, I do not have the means to go as I work every weekend. I need someone from their accounts office to call me urgently on + ********** 6904 please