Failure to resolve any issue.

I got a top up contract with Cell C in May. So on my app I got my account number and made extra payments into my account. However that two payments is still not on my statement. Every time I raise a query, they send me an email to say it was allocated to my account, however it is still not on my statement. How on earth do they provide you with and account number and the money is not reflecting on my statement. I've requested them to communicate with me on email ONLY, however they ignore the request. I do not want to speak to *********** people. I do not want to hear one more person to tell me there is nothing they can do. My frustration with them is to a point where I've lost my respect and should they persist on speaking to me over a phone, they will have to take verbal abuse. I've send them all the proof and nothing gets rectified. I am really disappointed in them as a service provider.