Taking more than double the c/ph contract price

This is the letter I send on the 5th of May to debt collection agency and I received a reply on the 7th from her that the complaint has been forwarded to Virgin Mobile, but it is now the 21st and I am still waiting for a response from Virgin Mobile. <br> Dear Sajida, Herewith,(1) the letter from Gerhard Buchner Attorney, shows R389.88 plus costs dated 4/9/2014. (2) Your statement dated 9/10/2014 shows R439.88 which also reflects my first payment. of R50.00. and after that payment, I paid R100.00 every month, in total I have paid R750.00 to date excl the R350 I paid to Virgin and not Agency.For your information, my cellphone contract was fully paid up.The initial contract was for the amount of R1379.04. That contract expired on the 22nd August 2013. But because I phoned them on the 20th Aug to remind them my contract will end on the 22nd and I need their statement to pay the final amount, they told me, I must give one month's notice, so I will get the bill in October, so because I disputed this, I reported it to \Hello Peter"they decided to hand me over"