Online account payment rip-off

I paid my account installment directly on my online TFG profile on the 7th December , up to today it’s not reflecting . @home keeps calling me and charging me for calls even when I send them proof of payment . They refuse to use the bank statement which is the only proof the bank can give as I made the payment on the TFG platform and not on the standard bank platform which means they must be able to track it on their side . Now they have send me my statement and have doubled my December installment , this is unacceptable and no one is calling to try and resolve this matter. I am closing my account as soon as I settle it. Your service is rather very pathetic.