worst online shopping experience

so my partners birthday is coming up the first week in October, ordered a perfume online and got confirmation that the order was placed when i made follow up on my order I`m told the was a technical error with online shopping, and my order was canceled full stop, I'm now gonna have to restart the whole process, the item is sold out, must now buy it at a new price. furthermore, i had received a voucher from Edgars which clearly states that the voucher is applicable for online and in-store purchases. now I'm told that they think the voucher was sent in error, it's not Edgar's fault it's RCS who's to blame since are responsible for sending out SMS. my question is, what's going with the online store?, it seems to me that Edgars online shopping is a jungle where the rules are clearly not in my favor. the best they got is sorry. unacceptable really.