Unextable service from Makro

More than a month ago we bought items from Makro Cape Gate, upon coming home we discovered that the lid to water cup (**** Stanley) only way I know how to describe the item, the lid does not close and pops off, we took it back to the store, only for the store to reply at the returns counter that we did not pay for the cup, first of all we did, it was checked at security like normal when we left the store, so then they said they don't have anymore of the cups all of a sudden, so I went back into the store and what do you know there they are, email after email after email with no response, no phone call nothing, so I phones the store demanding to speak to a manager, after 25 min of holding call was disconnected phoned back same story, and then just no answer, for a company like Makro to treat customers like this and acusing me of not paying but it was and checked by security and then just no reply, thinking I am gonna leave this matter, I DEMAND that I get a new cup, and apology would be appreciated

Co tact me ASAP