Collection of goods not wanted

I received an router middle of February 2015 which I phoned Mweb the next day to inform them to collect as I do not want it as I do have a very good Router and I do not want to pay an extra R499 on my bill. They promised me that the router will be collected within 5 working days and my account will be credited. The extra R499 was deducted from my bank account the 27 of Feb 2015. I waited till about the 4th of March and started phoning them when are they coming to collect the router. Every time they promised me that a delivering company will come and collect the parcel. Only then will they credit my account. Another month has gone and my next payment has already gone though my bank account without the credit of R499 and still no collection is done for the router. Everytime they have a different story why they have not collected it and blame it on the courier company. I really don't know what do anymore as they do not keep their promises. They are quick to debit my bank account for items but can't seem to credit my account after more almost 2 months? Can someone help?