CCS Compu tech are Sterling money

In December I got an email from ccs compu tech for amount of R1400 and I paid R600 and told them that's what I could afford in January 2021 they send me email stating i owe them R1700 and after lots of emails and informing them I'm busy with a case at CCMA the said they allocated my R600 payment but never send me proof and today 19 February 2021 they send me that I owe them R1700 and was handing me over to attorneys this is a never ending battle with thus company