Call centre incompetence

I tried linking my mobile number to my Telkom account on their website. Part of the registration is to enter a number and the system will send you an SMS. I cannot get an SMS since the SIM card is in my laptop and Telkom has no mobile app to SMS to. I tried getting assistance from Telkom's call centre but as expected they are unable to assist. Their advice was basically to buy another device to add the sim card in to receive that SMS code. Can someone competent please contact me to just to link my mobile number to my profile on the website. This shouldn't be that difficult.