Mtn breaking their own policy

I did upgrade throu Mtn direck. They sent me the wrong laptop. I report it the same day after I have received it. After 6 Weeks I finally get mtn to collect the laptop. It should be only take 3-5 working days. I sent them servile mails and phone calls. Each time I phone the lady who did the upgrade is not there nor her supervisor. They would sent me mails or phone me, but they don't. When I asked them when will I reveice the the right laptop, they told me that they haven't got it because it was wrongly discrip in the catalogs for moths.

They already invoice me and I payed for it. Still after 7 weeks I dont have any divice but I must pay for it. Mtn doesn't keep to there own policy.