Shocking customer service from Takealot

We purchased a set of speakers and sent it back because the one channel stopped working after about three days. Takealot said they found nothing wrong with the set and after two weeks it was delivered back to us. Now, again after two days the one channel has stopped working. We don't know how to resolve this because Takealot doesn't have a telephone number or a complaints channel. The agents we deal wiith are arrogant and refuse to engage in a conversation about the fault. They clearly don't care about looking after their customers. I will never purchase any thing from Takealot again.