BAD SERVICE!!!

I bought a charge controller from Zulteck (R1197) on 17-03-16. Got home and it was faulty. Went back to Zulteck the next day only to be told that they don't have stock, they gave me a \loan\" unit (wich also did not work) and said they will have stock the following week. Phoned them on 22 / 23 and 24-03-16 and each time got excuses. Phoned the following week again and each time Janet is busy and will come back to me, she never did, I had to phone back every time. I went and bought another controller from difrent supplier as I cant wait for Zulteck. Gave back the \"loan\" controller on 08-04-16 and asked for refund as I bought another one, only to be told no refunds, only in store credit. Janet agreed that they will refund me as this was not my fault. Send her my banking details on 11-04-16. Phoned her on 12-04-16 and was told I must wait till next week Tuesday as that's the only day they do payments. Emailed her on 19-04-16 to remind her of my refund and no response. This is the worst service I received from any company. I will not recommend Zulteck to any person. "