Horrible customer service

We bought a stroller online at babies R Us for our first unborn baby. It was shipped and arrived yesterday. After reading all the instructions and guide we discovered a mechanism was not properly clicking. This was a safety concern. I refuse to place an infant within a stroller that is not properly clicking all its safety mechanisms. The next day I came to the Langley store at Willowbrook mall in Langley, BC. Upon arrival there was nobody at customer service. Then, I had to wait a few minutes (I am very pregnant) for someone to show up at their job. The lady took my receipts at told me to wait aside (still more standing while very pregnant) while a baby-R-Us employee come to check what was wrong. When the employee finally came she asked what was We bought a stroller online at babies R Us for our first unborn baby. It was shipped and arrived yesterday. After reading all the instructions guide we discovered a mechanism was not properly clicking. This was a safety concern. I refuse to place an infant within a stroller that is not properly clicking all its safety mechanisms. The next day I came to the Langley store at Willowbrook mall in Langley, BC. Upon arrival there was nobody at customer service. Then, I had to wait a few minutes (I am very pregnant) for someone to show up at their job. The customer service lady took my receipts at told me to wait aside (still more standing while very pregnant) while a baby-R-Us employee come to check what was wrong. When the employee finally came she asked what was wrong with the item. None of the employees ever greeted me. I explained that a side of the infant carrier was not clicking into the stroller. In a rude tone she said "what do you mean is not clicking!" and started to fiddle with the stroller to fix the issue. The employee fiddled with the stroller for a few minutes. After a while she discovered the cupholder was a bit detached and it was affecting the clicking and proper attachment of the infant carrier. Then she went on to say (in a rude tone) how that was my fault and that there was nothing wrong with the stroller. This is my first baby and I am new to this, there is no need to shame me for failing to see an issue that took a trained employee a few minutes to discover. There was no acknowledgment of my safety concern for my unborn infant. There was no regard that other customers were listening to her unthoughtful remarks. When I tried to detach and re-attach the infant carrier, it proved difficult. I recognize that this could be due to lack of experience. However the employee with an impatient tone and impatient mannerisms demonstrated again. I explained that this was not working and I still wanted to return the item. She said I had to talk to the manager, turned around, and blurted to the other customer service employee (who was helping others) that nothing was wrong and she had to call the manager. Then I had to wait standing some more. When the manager arrived, like the other employees she did not even greet me. She said that I could not return the item because it was used and not in the box. She did not even notice that the item arrived the previous day. I explained that it was not used since my baby is still in my womb. She said she could not do anything to help and the item had to be in its original packaging. I did not bring the original box because it was too big to fit in my car. I still have all the wrapping and box. I left the store with a horrible feeling. My safety concerns were not even acknowledged, their interactions with me were rude and they belittled me for not knowing what was wrong with the stroller with no recognition of my pregnant state and all the learning curve/pressure of first time parenting. My husband might put the stroller back in the box the way it came and since it is new and in its original packaging we might try to return it. However, I personally don't think I can come back into the store. After their horrible treatment I even cried in my car on my way home.