accuses upon accuses

Please advise that I am very unhappy with response that I have just received from the call agent She kept making excuses upon excuses as to why I never qualify for the free chocolates and the delivery date which they changed caused of system errors on their side

I called in yesterday and I was told that I still had time to place the order and will received free chocolates and the delivery date was the 13th of Feb 2018 Now I called in to track my delivery and I am told I don’t qualify for the chocolates as it was late as the deadline was 11:00 and the was a system error and it will only be delivered tomorrow I don’t understand this I should be penalized for a system error

The gift came with free chocolates when I purchased, the agent told me that I paid late and they received the proof of payment late and just gave me excuses. At the end of the day this was not my fault and I would like this matter to be sorted and I want people to know how net florist decide on deadline date without the customer themselves knowing so.

I'm extremely unhappy with the response I received and quiet angry at this point of time Kindly sort this out for me please