Refund refused because it was Day 8

I booked two return flights CT to Jhb on Safair on 24 June. <br> On 2 July I attempted to cancel the one return flight (i.e. 1 of the 4). Their website says clearly they do not do refunds unless it is within 7 days. They do not specify calendar days or working days. Calendar days would have made 2 July day 8 (1 day over), working days would have made 2 July day 6 (within their \policy"). <br> They are refusing to process the refund saying it is 7 calendar days and we were one day late requesting the refund"