no statement sent but account is arrears for R19.00

I did not get the dec 2019 statement , I made a payment of R300.00 assuming that my premium ranges between 300-350, then I get the dec statement on the 06 Jan and I get nasty sms in capital letters that my account is overdue. The dec statement sent does not even reflect the payment I made on the 22 dec. I called their centre since the 06th and the line keeps cutting off after holding for 30 min. Again I took an initiative to email them but no one responded, instead I get another sms in caps that my acc is overdue, I call them again and couldn't get through, sent another email still no response. I called again yesterday, chose a different option so that at least I can speak to someone, eventually was transferred to the correct department then im told the statements are sent between the 1st to the 10th of every month, again I asked when was the dec one sent, the lady said :"mam I said the statements are sent between the 01-10th of every month", I said I don't dispute that, I am asking the date the dec 2019 statement was sent, she said there was a system error hence the statement only came in Jan 06th, ok I asked how then is my acc overdue when I was not sent the statement but at least I paid 300, she said my instalment due was 319 and I paid 300 so I asked if that the reason I get sms in caps that im overdue with 19rand - i asked her to send me that statement again - she sent me the incorrect statement(nov) - now I want an apology for your consultants lies and wanting to insist that y account is overdue and whos fault is it that I did not get a statement in time. in that letter it should be stated that my credit profile will not be affected by this in anyway due to Game's incompetency, this is really ridiculous!!!!!!