Customer Service, which is non-existent!

I feel like Customer Service, is an area of a business, which is there to assist customers with site related queries or issues. Zando seems to excel and being the exception to the rule in this case! All I WANT and NEED is a bigger size. I ordered an item and received it on the 31/03 - managed to fit them on this morning and they're too small. Call your CS depart. and am advised that you do not follow an exchange policy, only a returns process. Fine - let's do that, however how much would I pay for the new order post using a promotional voucher? I'm then told I would pay R100 more than I did previously. Really? The customer service agent then refused to put me through to someone who can help me find a solution to my problem. I'm not dumb, I understand your policy, but actually do your job and help find a solution, instead you choose to repeat yourself over and over, like I'm a 4 year old child! I find your agents tone to be condescending and rude! Thank you for consistently being unable to assist. Now you have a splendid day!