Hyperli ignores my emails. im requesting for a full refund for my purchase

On the 26th of September, i bought Introductory Scuba Diving Course for Two *2 vouchers. I called in Scuba Evolution before purchase to find out if they do have a slot open that weekend of the 29th and i emphasized that i can only be able to do it the same weekend as ill only be in the city then and they advised they do have an open slot so i continued with the payment. After the payment has been received, they advised they have detected a virus in the water and therefore no one will be allowed to complete the course. I then requested a full refund, ive been sending numerous emails to hyperli requesting for a full refund and ive been ignored till to-date. My contact details are : ********** 845