Online return - no service

Shocking service when it comes to retuning something bought online. I have been trying for 4 days to log a return and can't seem to get anywhere, when asking the 'client services' what is going on they told me I must call the courier myself. No reference, no number and no name were given to me, so I presume I must just try find a call number online? There is also no process with how to tell them which of the 7 items that we bought, that we would like to return.