Takealot

I bought a product and paid with a partial payment using a coupon. Takealot informed me by email that the product was no longer in stock with the supplier. However, the very same product is still being advertised with the same reviews, etc. Only, the price had gone up and a new supplier's name appears. They credited my account BUT without the value of the coupon included! So I'm thinking that the supplier is playing games here! I feel I've been done in by Takealot and the supplier!