Frustrated customer

Dear Vodacom

I about ready to pull my hair out right now. Since last year I've been trying to resolve my contract with you guys. I signed a contract for 24 months but now I get told the contract is actually 36 months and now I'm still paying a device that I should have been done paying. I've tried doing this through the call center but after many calls I finally got told I needed to go back to the store. I've now moved away from Centurion so last Wednesday I called the manager named Costa to resolve this. He then took my details and said he will call me back. On Fri I decided to call back as he had not contacted me. Never returned any of my 3 calls. Today I called to speak to him and he's like he wants to put me on hold so I asked him to call me back instead. He never called back so I decided to call back. He was busy and never returned my call. I've had enough. Can someone please put me out of my misery and sort my issue with my contract