Order rejected that is in stock online and instore

I purchased a floorwiz dual combo mop from Leroy Merlin yesterday 27th April 2022, the product was available to purchase but I received an email this morning stating that my order was rejected by Verimark as they have no stock. I went onto Verimarks website and the product was very much in stock. I received a R200 payflex voucher which I used for this order and now forfeit the voucher as it is seen as a refund. I called the manager of the online orders and who works with Leroy Merlin Chery and Jessica. I asked them if it possible for them to arrange for me to collect the item at a Verimark store and keep the refund or arrange something for as I was right there at their Verimark store in Clearwater mall and was told by Cheryl I could do that and Verimark can issue the R200 discount and when I spoke to Jessica she just said they are sorry but there is nothing they can do to help passing the buck to Leroy Merlin. Now I am inconvenienced having to wait 7 days for a refund of a product I purchased that is very much in stock in other of stores and online on Verimark.I feel like they could have helped me,between Verimark and Leroy Merlin they could have assisted me as the product was not entirely out of stock and they could have arranged to assist me by getting stock of the item to one of their stores for me and not just reject my order ND inconvenience me by having to wait 7 days for my refund and forfeit my R200 voucher.