VODACOM IS A TOTAL REAP OFF

I took out a contract with Vodacom in November and I was put on an open package without having the sales consultant explain it to me and this is the SMS I received from them "You have exceeded 50% of your R3739 mandatory call limit usage on ***. To update your limit, visit Vodacom.co.za or call 082 111 for queries." I called in December and they told me that they would look into the matter and get back to me which was never done and I asked that consultant to put me on a top up package which was never done. I called in now again and was told I owe Vodacom just over R3000 and my contract is just R250. VODACOM IS A TOTAL REAP OFF