Poor Misleading Customer Service

On Thursday last week, I made a booking for accommodation at Beach Frond Apartment Afsaal in Amanzimtoti. On Thursday an alert came up from Where to stay about the exact same apartment for R545 per night, since booking.com price matches, I screenshot this and sent to their customer service together with the link. I had still not received a response on Monday so I wrote back since they had already requested the confirmation number and pin on Thursday already so I assumed that they had already did their verifications. On Tuesday Daisy writes back to inform me that my claim is invalid because this was supposed to be reported before departure and they cannot view the link. This was reported on Thursday prior to arrival at the apartment already. This is totally unacceptable and poor customer service. I will not use booking.com for my travel again as their advertising is false and I can get it cheaper elsewhere. Further to this, I had earned a reward of 10% which hasn't been paid into my account either, another false statement from this company.