Poor poor service on date change- with arrogance

Am currently working in Nigeria and use(d) Netflorist at least once a month to send flowers or a gift to my wife ( chivalry still exists right).

Ordered a premium mothers day hamper for my wife on 4 May 2022 and erroneously entering delivery date of 9/5. within an hour of picking up this error I contacted them via their contact email address.

It took 24 hours to respond and was bluntly told no we cannot change the date as our system is fully stretched that day. Initially they said can only get delivery on 10/5 and after a lot of hullabaloo with untrained operators ( poor Kwanele & Pulane) no supervisor willing or available to escalate my issue to the after 3 days committed to delivery on 9/5. Surely this is their biggest day of the year don't you plan for some mistakes by frequent clients and attempt to accommodate them? I am in the service industry myself ( hospitality) and what we are trained to do and I daily train my team is to try and turn a negative guest experience into a positive one, either by actions or emphathy especially (and don't perceive me as arrogant please) with a frequent client who orders monthly and not for small amounts.Don't they have a customer history?Not looking for a freebie but wanting all to be aware of the attitude by Netflorist and better triple check your facts before you pay them as they are relentless in their zest not to accommodate clients if they made a small mishap and informed you immediately.