Incorrect Invoice

I am completely livid with iGrow, they are honestly the worst property organisation I have come across. I am a tenant at Kingstone Mews for the past few weeks I have been receiving invoices with for water bill amounting to R859.47 that I settled on the 26/05/2020. Despite the efforts I've made of responding to their emails that I have already settled the amount they still sending me invoices. Yesterday I resorted contacting their offices and asked to speak to Bianca Botha or Bianca Steenkamp Botha of them were not available to take my call. I left a message with the receptionist that one of them to contact me back urgently, left my name and number even went to the extent of expressing nature of a query to the receptionist. None of them has bothered to contact me back. Yesterday afternoon I received yet another invoice from them as you can imagine I am now beyond ****ed. This is not the first time I have experience such with iGrow last year the same thing happened I had to send proof of payment despite the fact that i have loaded them as a beneficiary. I am Gatvol with iGrow I had so many problems with them in the past on which engaged them in this platform as I am encouraged to do so and their internal process is completely flawed.