The up-graded Viodacom contract

I Pertunia ID no:***, Cell no:***, had a Laptop contract in which i was paying R429. The contract expired on Jan 2015. i was supressed to see the amount of R829 deducted on my banking acc during Dec 2014, when i query it with the local branch in Polokwane i was told that i have upgraded the contract on the 5th Nov 2014,in which i did receive the i-phone 5s. i told them that the upgrade it was done without my knowledge and i have been adviced to make affidavit and submit it with my certified id copy to Polokwane Head Office to: Mashudu(on Dec 2014, but nothing was done(WHAT A BAD SERVICE).on my follow up with Vodacom Customer Care, i was told that the i-phone 5s it was delivered at: BOPHELONG CLINIC AT VANDERBLIPARK. and again was told to submit the affidavit and my certified id copy which i did and faxed them to head office in Feb 2015. Please help cos now Vodacom is claiming that i owe the R5000 which i did not know that my contaract with them is upgraded. when i call the Customer Care they transfare the call to LEGAL DEPT and i hold 40m,no one answer the call and i don't get any help, pls assist urgently.