Angry and disappointed customer

What an appaling experience I had with Truworths Wonder park. I went to the store to make an exchange of items. I was then told that the return period has passed. I asked what should I do with the items because they are small and don't fit my child. The items are still new with tags and I have the receipt. To be told by their cashier that I am making noise, the other customer next door could not stand there and listen to the cashier disrepecting another client she told her not to speak to a customer like that. I was then given a web page to sent my request. I received an email from their customer service "the initial return was declined due to the return policy. WE CONFIRM THAT OUR AREA MANAGER HAS AUTHORIZED A RETURN AND THAT YOU WERE MADE AWARE. I went back to the store with the email, only to be told that their area manager doesn't know about my enquiry and there is no authorisation. Such a reputable store with such customer service. I again told the store manager that no one said anything about my complaint about the behavior of their staff, she then said they are dealing with the issue internally. I am the one who complained I should be kept in the light of what it is happening with my complain. I had to ask the store manager Neo to follow up with their customer service as she was saying there is nothing they can do. The service level doesn't match the prices in the store. Can somebody please get back to me.