Unhappy customer

I'm new to the Mr. Price family. Wanting to purchase from the app due to it being so easy and very convenient it's not allowing me to do so. I have phoned in and stated my complaint. The lady in the call Centre just advised me to go on Google Chrome and do it from there. Yet when I get to the payment section it's still not allowing me to purchase from my account. This people really need to sort out the selection of purchasing with your account, I do not wanna go to any stores if they wanna make it more convenient for a customer to purchase from the comfort of their homes.