Call centre incompetency

i made a lump sum deposit towards my Residual on my car finance on 20/06/18, i called the call centre on 21/06/18 advising them to allocate my payment towards my RESIDUAL, and was told that this was all taken care of and upon receiving my statement yesterday this wasn't done as i've asked! i am furious! also received a text on 22/06 at 08:24 stating: 'your request has been successfully processed on your absa vehicle and assett aacount.' LIES!! they have deducted this against my capital charges which i clearly instructed NOT to do!! kindly revert back to my call as you record all calls! i am furious!! this is the second time this happened!! if this is not resolved as soon as possible i will not be dealing with absa in the future at all!!!