Terrible service

I have a mont blanc case for my samsung note 4- which is currently tearing apart- this is the second cover with the first one deteriorating in under a month. The cover costs R2500 which supposedly comes with a guarantee- unfortunately the manger in the Sandton store now tells me I have to wait for new stock to replace this- which i find unacceptable as i didnt wait to pay them for this item. Its been over 2 months with no movement on my complaint and I find it utterly terrible to walk around with a torn cover as I have spent alot of money on a product advertised as premium. I see no value in a guarantee if a company cannot be held liable for it and i feel that store mangers can really tarnish a quality brand by not providing premium services: to note i am a repeat mont blanc customer and i have purchased pens jewellery however this will seriously affect my future purchases as this is utterly unacceptable.