Wireless Router

I was contacted by Vodacom with an offer of receiving a wireless router for R109,00 per month, which was to be added to my present account. I joined Vodacom early May 2015, and paid in cash for May 15, after which the monthly invoice is deducted from my bank account. So I had been with this company for about two months, and then after this offer was made, nothing happened. Upon enquiring about this, I was told that it was declined due to payment issues. This is where I have a major problem. I had been with them for two months, don't owe them a cent, but they decline an offer that they had made without my approaching them. Mail after mail I wrote, was electronically rep**** to with a service number, INDICATED FEEDBACK WITHIN 24 HOURS, but that was it. I want to know what this will do to my credit rating, but who cares, each employee receives their salaries, so I am OK Jack. Very sorry I entered into a 24month contract with them. I feel betrayed. VODACOM is a very POOR company.