Incorrect Parts Supp**** and Poor Customer Service

I ordered a set of fuel injectors for a 2004 Fiat Stilo from Speedquip.co.za. Before paying, I contacted them via Whatsapp to confirm stock. The fuel injectors arrived quite quickly, which I was happy about, but they were not correct and did not fit the car. I contacted them again via their Whatsapp number and requested a refund or exchange for a set that fits the car, but they have ignored me for the last two and a half weeks. Really disappointing service.