Double Payment due to no communication from Vodaco

My dad passed away in December, I switched the two numbers from his name to my name in December and the person at Westgate store never informed me that their will be a cost to this transaction and that the two lines will be moved to my existing account with Vodacom. <br> On the 25th of January I paid over R560 for the 2 lines moved to my name. On the 29th Vodacom also debited my account with that amount. on the 1st of Feb I made the first call to them and also send through a proof of payment, no reply, I phoned on the 4th again and also send the proof of payment again, no reply, I phone back on the 9th again and send through the proof of payment still no reply, although the guy from the call center logged the problem on the 9th, still no reply, I phoned again today and after speaking to 3 people I get told that they will look into it after I send them my bank statements. It will still take 7 to 14 days, but I must remember that for future reference if I do not pay may account I will be charged R10 I did not even listen further. My account has never been in arrears and now they throw that in my face because of their mistake??<br> I really need this sorted asap.