Unable to understand my simple query

Every time I try to recharge my data bundle on my LTE modem (once a month), I need to take the sim card out and put it into my phone to read the one-time pin i get from MTN when buying this data. This is highly annoying and I cannot find anywhere on the website to change the notification method to email or another phone number. It seems ludicrous that this isn't easily done.<br> <br> This was not understood by the lady I spoke to in the MTN call centre and I went round in circles on the self-help menus. What a waste of my time and really unhelpful. I had to enter the mobile number time and time again in different menus and in the end I gave up. <br> <br> Please help me to change my notification method from mobile number to email or another mobile number somehow. This will be greatly appreciated. I wait to hear from you soon.<br> <br> Regards,<br> <br> Paul