Struggling to do an upgrade

I have been trying since January to do an upgrade. I went into my closest store twice. The first time I was told someone would phone me. The second time I spoke to a consultant Funda-Lunga Tshabalala [ MTN South Africa ] <***> who emailed me to confirm he would let me know when stock arrived. No response when I emailed him to inquire. I have tried twice to upgrade via the MTN App. No response. This morning I tried to upgrade via the link in the email you sent yesterday. The OTP does not come through. Would it be easier if I just ported my number over to Vodacom when the shutdown is over?