Harassment

Good day

My sister in law is being harassed by Toyota financial services. Understandably we pay the vehicle via eft and are late but that doesn't give them the right to phone over 30 times in a space of 4 hours. Today alone they phoned 19 times in 2 hours. I mean it's ridiculous , plus we receive the sms and emails. Once a day via sms/ phone should be more than enough.