Waiting since September 2020 for a pnp/woolies R400 voucher

I called vodacom in August 2020 to cancel my contract and the agent I spoke to said I had a good record with them and that I could do a upgrade which I refused. He then said he could offer me a deal with a phone, extra 200 minutes and a R400 pick 'n pay or woolworths voucher which I then agreed. He said the voucher would be sent to in 15 days. It is April 2021 and still no voucher. I have called elite mobile since October and they keep saying they have system issues. I called Tuesday 6th April and I was told the deal I agreed to does not include a voucher. I've asked for the call recording and I was promised that a manager would call me. I don't understand how vodacom can be in business with a company like this.