Poor Online Sale Service, refund policy and higher prices

I purchased an inverter via online, paid for it with my RCS card and the amount came off my card. This was on the 23rd Feb. Delivery date was scheduled for the 9th March. On the 9th Mar I called in for an update, it was like no one new of the order. Then they communicated there is no stock and the department will be contacted for an update. The department responded the supplier had no stock. Then went on, initially i did all the communication. No one from builders contacted me. Only one customer person tried her best, Jonnelle Siljeur but she also got no joy from no one. On the 19th May, see how long i have been waiting and no one from builders offered any alternatives, i had to ask and till now they could not give me a like for like. On the 26th May, the refund was initiated. Don't know when it was completed but my RCS was never credited. When i asked, they said they do refunds to RCS accounts. I don't understand this as builders is part of RCS. I also asked as Builders did not fulfill the order, to refund the interest charged, there is no answer on that. I have still not received my refund and I am totally disgusted in the overall service from a company that been in South Africa so long. Your prices on certain products are also above most competitives and no one can explain this to me. The department seems to be no existent in all this and no manager has ever called me to apologise. I need the CEO or Vice CEO to contact me. They need to know their company has appalling service.