They took my 400 and don't want to allocate it

I had an account with telkom which was handed over to nudebt,I paid my account and the end of July I paid 400 rand,to my surprise when I asked for my statement I'm told my account has been handed back to telkom,no one told me and finally u get my statement which shows all the other payments except for my last payment,I then ask them on email on what happened to my last payment because it doesn't even reflect on the statement and where is it gonna go since my account has been handed back to telkom,then suddenly nudebt stopped responding,I send several follow up emails and still no response until today,all I want is my money back or for it to be allocated correctly or send to telkom for my last month payment,but to date no response