Harrasment

I have a vehicle that is financed by standard bank which I purchased in October, of which they said I don't pay on the 1st month. They started debiting me in November and I have been paying ever since but I constantly keep getting calls and messages that my vehicle is in arrears every single day even when I tell the people who call to take a look at my statements. This is pure harassment from this bank, I'm really disgusted by this.