Bad customer service

I was assisted by Asive after I reached out with an interest to study, he urged me to pay asap because classes starts 1 August. After making payments, I didn’t receive any communication or materials as promised. Besides that my source of income has changed and I opted to cancel and request for a refund, now Asive doesn’t respond to my texts anymore like he used to when he wanted my money. It is the 12th of August and I haven’t received any communication regarding my study material even if I was interested in proceeding with them.