Bad customer service

So I bought x3 novex Collagen Hair Mask on the Bash app because it was on 3 for 2 so I thought wait let me seize the opportunity to buy it because I've always wanted to try it, I eventually put through my order and they told me that my order will arrive in multiple packages and I was fine with that so my first part of my order arrives and I chose the option to collect in store because I work in V&A so I just thought it would be convenient, I then go and collect my parcel with my ID at the foschini store in V&A all to find out they sent me the wrong item I then immediately notify the lady that assisted me and we even open the package together because I told her that I can already see that this isn't my order because I know I'm suppose to receive a 1kg hair mask and this package is too small, I then asked her what must I do now because as long as I'm ordering online I've never had to return something on bash, she then tells me that they can return instore and what so ever because it's from Foschini they can return it instore, she then calls her manager Chad who immediately says no there's nothing they can do and they can't help me I must phone bash and they will collect it from me and I must do what they say, I was so confused by what just happened he was so rude and busy with his own thing he didn't even really attend to the issue or even try to assist me in anyway leaving me scared and confused because never in my life did I ever have to go through something like this, I eventually left with the wrong parcel they sent which is a 300gram Novex Conditioner, I then send bash an email explaining what happened the guy from bash then told me it needs to be refunded in the store because they can't do exchanges on cosmetic items via courier I then explain to him that I just came from a foschini store and they told me they couldn't help me ,he also couldn't understand why the manager didn't want to assist he then apologized and said unfortunately I'm going to have to go to a foschini store and let them have this issue sorted. The next day I get an sms that the other part of my package arrived, I then go and collect the second part of my package at the same foschini store, I explain to the lady who is assisting me about the wrong package and what the guy from bash said what I must do she's ready and very willing to assist and she's even telling that she can check other stores and it seemed like she was going to assist, she then comes back to me after speaking to the manager Chad who refused to assist me the previous day, who is now refusing again today. He told her to come tell me there's nothing they can do to assist me, this is really frustrating for me as a customer because this is not my fault that they sent me the wrong order now I have to run around and go to other stores to see if they have stock of it so that I can exchange it there, this mistake they made now became my problem and I have to deal with it. I'm very hurt and disappointed by the way the manager Chad handled everything, I shop regularly at Foschini and I'm almost everyday in foschini because I love the stuff you guys sell and I'm always looking out for new stock. I really didn't expect such behavior from a manager.