Very poor after sales service

I puchased two crutches from Mobility Direct on 14 May 2018. I specifically purchased it in order to use on 9 June, so I only opened the package on 8th June. On the day I used it only for less than an hour (from the car to a theatre and back to the car), but immediately found that the handles were very hard on the palms of the hands, leaving a painful indentation after just a few minutes on it. Immediately the next day I wrote a letter to Mobility Direct for attention Lance Williams. He did not respond. I phoned three days later, then he was out. I re-sent my letter four times, with no response. I phoned today and spoke to him, but he was not helpful at all, stating that they have a 7 day return policy and that I had to courier it back to them at my cost. I explained that I am disabled and cannot get hold of packaging materials, etc easily and again stressed that I only used it for 45 minutes, but he was not interested in "bending the rules" so to speak. As I only paid R399 for the crutches, and it will probably cost me R50 to have it packaged at a PostNet or similar, plus then courier fees, it will not pay me to return it ... and then having to wait and trust them to refund me. In one of my previous e-mails, I explained that I am in the market to purchase a "ride on' s****** soon. I mentioned that fact again today, but obviously after the "attitude" I got from him and his unwillingness to assist me in taking back the crutches, I will definitely not purchase anything from them in future.