Watch not returned

I booked my Casio Watch for a battery replacement at Edgars Kollonade on 5 June 2015. I was informed that it would take maximum 6 weeks. It is now 2 months later and I still do not have my watch back. I have personally been at the store 3 times in the last 2 weeks. Each time I am informed that the supplier will be contacted and that I will receive telephonic feedback. I have not yet received one call from Edgars in this regard. It is also impossible to reach the store via telephone, as the phone is never picked up. Extremely poor customer service.