Unhappy customer!!!!!

26/06/2020 I made payment and ordered a swipe machine from Yoco, they told me I will receive the machine within 3 days, I never got the machine, days went by and I still never received the machine so I called them and they kept on saying they'll get back to me and never did, on the 13th of July 2020 I called them again to find out what's happening and I requested a refund, until today I haven't received my refund and they keep on telling me they'll get back to, I am getting really impatient with these people, they are unprofessional and their communication s****s are horrible, for the past 4 days I've been calling them and each and every agent has a dumb excuse and passes the blame over to the next agent, any suggestions as to what I can do regarding this issue?