Bad bad bad bad bad service

I ordered a laptop from vodacom. I was told it has 4gig RAM and a 500gig hard drive. When i got the laptop it had 4gig RAM and 64gig hard drive. So i returned it. I app**** for another laptop. Which is two months ago. I havent received the laptop. The one i app**** for two months ago was R199 a month for 36bmonths. I have been calling about this deal but i have been take to pillar to post. Last week monday i was called about this new laptop they wanted to deliver which was not R229. I said the deal i app**** n got approved for was R199. I was told they will listen to the recording n get back to me within 3working days. Its Wednesday today no call nothing. Yesday i called n i was told the agent who help me will call ASAP, still waiting for the call. This it the worst experience i ever got. It like they dont care but on my invoices i am charged two contract while they cant deliver the secont one. Its two months now i am getting billed for two contract when i have one. When u call their finace department they will blame sales and when u call sales they blame finance. I dont know whats happening over there but i want this situation sorted ASAP, and its my last contract ever with vodacom. I dont want so much headache again, enough is enough. May someone who knows what they doing sort my situation, i am tired of calling vodacom without any help.