Wrong part with correct label delivered-I want a discount to compensate

Generally it had been a good experience, but they seriously dropped the ball this time : I ordered a large monitor with speakers, they are rare these days. One week eta. All good I thought. Closer to two weeks I get the item, eagerly open the box to find a different SMALLER monitor WITHOUT speakers in the box, with the CORRECT label on the outside of the box. Mmmmm, something fishy here, me thinks. I contact them, and basically get the runaround, as there is the company policy, and they just work here. I hammered away with email forms, complaining that this is not my fault, it is Takealot's fault, they made me wait longer than they originally showed, and then tried to give me the wrong product with a correct label. They must give me a discount on the next item, as that monitor I originally ordered is no longer in stock, and similar others are way more expensive. Someone called, and said they would keep the ck out up to management, but nothing to date, and I just bought a more expensive monitor with speakers. Definately not a happy chappie in this instance.