Unacceptable Service

On the 21st of Nov 2019, I called Vodacom to take out a sim only contract. I requested that my current prepaid number be changed to contract. I was assured that all was done over the phone. A few days later I had noticed that the caller ID was not activated on the line so I called in. At this time I was told that they would log a call to activate the caller ID. About a week or so later nothing was done. on the 13th of December when I had called back to query they stated that the contract was cancelled and never issued. Since then I've been trying to either activate the Caller ID or to move back to prepaid and NOTHING has been done. I've made over 20 calls to Vodacom and nobody seems to know what's going on. I'm not sure how to get past this.