No answer 4 several days when calling the supplier

Purchased a WiFi router through Mondo. Waited weeks for delivery although they already took the first payment from my bank account. Stopped the debit order immediately.<br> <br> Unit is not working. Did a sim swap and still is not working. <br> <br> Now I'm trying to make contact with them, and their phones are just ringing and ringing.<br> <br> I want to cancel this so called contract with them, will also gladly send them back their unused product.