unable to top up after sim swap

I recently got a new phone that uses a nano SIM card. I performed a SIM swap at the Cellucity store in Tygervalley on 6 January to get a nano SIM for my new phone. After the swap I am able to make and receive calls and send and receive SMSs, but when I try to top up I get a SMS \You have recently performed a SIM SWAP. Please contact your Vodacom call centre on 111 to update your new SIM details. Merchant: ***". I phoned 111 and was told that they had to \""resync the line\"" and to turn off my phone for 1 hour after which I should be able to top up. I called the call centre more than 4 times"