Zando return and exchange useless and no response to emails!!!

I placed an order for two tops on Zando in the beginning of April, received them under a week later and noticed faulty stitching to the shoulder of the one top. Requested a return and excange to be made only to receive exactly the same top as the other one that had no problems.... how can a system be so unorganised that you do not compare what needs to be exchanged. This isn't the main problem.. I have since this incorrect exchange tried emailing on numerous occasions with ABSOLUTELY NO RESPONSE BACK FROM ZANDO.... customer service / customer complaints is there even such a thing within this company???? Tried calling but sat on the phone over 45min just on hold not even had the call answered yet!

Pretty annoying I would not suggest this site to anyone... what would they like me to do with doubles of this top? I paid for a different top but sit with two of the same! Super annoyed!!!