Standard Bank Mobile SIM card not functioning accordingly.

I recently ported my number from Vodacom to Standard Bank mobile thinking it a good move, but now I’m not so sure, my Vodacom SIM card has stopped working since I ported my number which makes sense, but now the new Standard Bank SIM card I received is also not functioning accordingly, I can’t buy airtime nor data, it gives me an error every-time I try recharging, I can’t call nor receive calls, I know the SIM card is working because I can see the network bars at the top, but it’s useless because I can’t call or do anything at that, I’m stuck with two numbers that I can’t get a hold on, clients have been trying to get a hold of me as I’m a young entrepreneur, but they can’t because of this issue, I’m losing business because of Standard Bank mobile poor customer service, I emailed their support team at *** on Wednesday the 27th of May 2020, no response, again on Friday the 29th of May 2020, today it’s Saturday the 30th of May 2020 and I haven’t receive any response from them, and I can’t call because both the numbers I have won’t allow me to call, I’m even thinking of going back to Vodacom, even though that was an abusive relationship but at least it was working, I’m not one to complain like this, I understand everyone is trying to do their job but when the Country is facing a pandemic and you can’t even make the income you were surviving on because of a SIM card , it’s really unacceptable, I’ve had excellent experience with Standard Bank as a customer, I was so excited and didn’t even think twice when I got an option to move to standard bank mobile, but now I’m very disappointed, I need help with this matter urgently.