Unprofessional and horrible work ethic

I went shopping on Thursday 13 December 2018 at Zara Sandton City and bought myself a pair of white suit pants and a blue blouse for a Birthday high tea I was attending on Saturday 15 December 2018. I absolutely loved my look and while enjoying myself at the function, I sat on the chair and I felt my pants tearing, luckily the blouse was covering the back so the oops was not visible, I then stood up walked and the pants kept tearing. I decided to head home and as I got into the uber the pants continued to tear. On the 19th December 2018, I took the pants back to Zara Sandton City and advised them what had happened, I was requested to take another pair of pants or something equivalent to the amount of the pants in question. Because I loved the pants I wanted the very same ones, so I proceeded to fit a size bigger to what I initially bought (Small size) and unfortunately they were big as expected. I went on to choose a similar cut but different color, however when I got to the till I was advised an investigation will need to be conducted, a representative will contact me and we will take it from there. I was asked to keep the slip and pants until investigation is done. When I brought this to management's attention - I spoke to Penny who looked at the pants and asked if these are the same pants that were brought in the previous day and I said no but that insinuated that there was a similar complaint brought forward. The very same day I purchased another pair of pants cash, which were actually the ones I was supposed to take as an alternative, however I ended up buying them due to an investigation that needed to be conducted before any decision to be taken. TILL THIS MINUTE, No one has been in contact with me, I had to go to Zara AGAIN to find out what the delay is. I spoke to Yolanda who is the store manager, she took my contact details AGAIN and advised she will revert back tomorrow after finding out what the delay is but no word from her too. I'm applaud by the manner in which this query was handled, I purchase Zara items EVERY 2ND WEEK IF NOT MONTHLY, I absolutely love your brand but the way I have been treated, very disappointing!! If I returned a R 679 item, what happens when a customer returns more than one item??? In essence I was welcome to assist with the investigation essentially to help improve the quality of the brand maybe, but in actual fact I wasn't even supposed to be involved in the investigation, these are pants I bought at YOUR shop, I'm not the manufacturer. All I wanted was to either swap the pants or get my money back (pants bought less than a week and worn ONCE) but at this point I want nothing to do with Zara, I just want my money back and I will definitely purchase the same pants at a different establishment. If at all anyone decides to contact me: ********** .