Poor service

Sanlam Very ***********, poor service, I am very angry, disappointed and frustrated about Sanlam, I missed a payment in July 2021 and made cash payment on the 02 August 2021, they didn't allocate it and keep telling me that that it is impossible to apply payment back dated and therefore they require that I pay again the premium for 2021(Which I Already did and they acknowledged they just don't want to allocate it) , if they cant back date how will they back date the premium that they require for me to in 2022 for 2021 premium, their Administrator copy the same response and forward it to me , they don't do an intensive investigation on this matter , they just copy and paste, I'm very upset and disappointed , imagine if they can rob me a mere R200 what is going to happen when is time to claim?