Empty promises from office manager

We booked an apartment from 23 - 26 May, on the first morning we reported that the geyser was broken, hence no hot water. They sent a handyman, who couldn't fix it and the night of the 24th, brought a plumber, who had no stock to fix the thermostat and element, which left us a 2nd night without hot water. I have been in contact with the manager, Jolene, since then, who offered us one night's tariff as compensation, which we accepted. It is now nearly 3 weeks since we left, and still, she has not refunded us our compensation, after she asked for our banking details. I have sent her numerous emails, sms and now started WhatsApp, but to no avail is she responding. This is actually such a pity, as the complex is lovely, but with a managing company with poor management standards and empty promises, I will definitely not give them my property to maintain on my behalf. I would actually like to make contact with the owner of this company to advise him/her of what has happened. Hope other holiday goers don't have the bad experience we had with our stay there.