Why can’t I use any apps On my Prepaid plan such as: App Store, iTunes, Snapchat, Instagram, etc.?

I have the $65 Prepaid plan with Autopay (which reduces to $45 a month). I had paid my bill on time and ever since then, my phone does not connect to any of these apps. It has been like this for a about 3 days after I’ve paid as if my phone has no service. But, I can receive and make phone calls and texts just fine.

I had called the AT&T 800 Prepaid number last night and I followed what to do. The woman told me to wait five hours to restart my phone and try again. I did so, and it still has the same issue. I’m frustrated with this and I need answers to fix this situation. Thank you for your help in advance.

Edit: Grammatical Errors