Bad customer service

I tried to purchase a get well soon gift for a friend online from Netflorist on the 28th of Feb. The total purchase came to R379.99, I chose the split payments option(R150 from my ucounts rewards card and the remaining amount from my gold cheque debit card). The ucounts rewards card was debitted, however (to no fault of mine) the payment from my cheque card declined. A block appeared stating I should contact Netflorist for a refund of the R150. The first time I called I spoke to a male he said he could not refund although their site said I will be refunded, whilst speaking to him the call got cut. I called back shortly after and spoke to a lady named Rumaraah she promised that the money will be refunded and all I had to do was provide her proof of the transaction, which I did. I waited till the 4th of March for them to send me a voucher instead of the refund promised, which was fine I just wanted to use it and get it over with. So I placed an order of R149.85 and tried to use my voucher of R150 as payment. The payment was declined stating that the voucher amount exceeds order price which didn't make sense to me at all as that's normal, and I would not have been able to place an order of exactly R150. I emailed netflorist's order email address to bring it to their attention. A lady named Candice rep**** stating that she will help me process the order from her side, so i give her my order consisting of a single red rose and a card to be attached. She replies and says they are out of stock of single red roses but she can offer me a bouquet of 5 roses which exceeds the voucher amount. This was when I really got upset and asked her to either let me know when she can deliver the single red rose as I had asked or alternatively she needs to let me know when they can refund me my money. It's a small amount but it's the principle behind it as it was no fault of mine that the debit card declined. To date I have not received a reply from netflorist. I think it's terrible customer service and not professional at all. I will not recommend netflorist to anyone.