cancelled contract

Good Day

I have had a cell phone contract since 2006. In 2015 I was give a router on contract as well but this was returned as I did not want or need the router. The monies for the router contract has been subtracted from 2015 and when I asked Vodacom to sort this issue out on the 23rd of March and refund the last four years worth of subscription as the item had been returned in 2015 they went and cancelled both contracts and have still not refunded me. I went to Vodacom Lake Side Mall on Friday the 12th of April in order to sort my phone contract out only to be told that they cannot re-instated a cancelled contract which Vodacom cancelled themselves by mistake and now due to this error my credit rating has dropped from 7 to 2 and I am no longer eligible for a new contract. This is a highly irritating and frustrating situation which has been created by Vodacom and now they cannot fix their own mistake and I am suffering for it.