Claiming money for returned goods and insane fees for cancellation.

I signed up for the Free Router and Free installation package, after 6 months I had to move due to the house being sold, I asked to have my service moved to new location. Please note that nothing is free, there are massive clawback fees, and should you stop on the 1st of the month you pay for the next month as well. This is ********* in many ways, however I had to pay R3,564 and then 2 months later another R 1,029 was deducted, this I was told was another "Clawback" this time for the router. Looking at the fact that these routers sell for less than R 1,000 and Vuma charges R 1750 for installation again the ethics for me is mind boggling. The problem is that I have returned the router the the Sandton office, and they are still calling me and threatening me with legal steps for stopping the payment of the router that I have returned to them, in the box and same state I got it in. They apparently cant find the router now. This is shocking service and I would urge all to stay as far away from this company as possible. You pay for something you return they advertise no contracts month to month but **** your budget in clawbacks. I did not cancel I moved. Four months later I still have not had the installation and still get phone calls to pay for the returned router. I asked to stop all possible services and still have an outstanding balance for something they have in their possession.