harrasment

consultants very rude phoning me every day, 4 times a day for a R300 payment due end of the Month threatening me they will keep on phoning if i don't pay now, and they will tell my employer i am not paying my bills, it that not against so sort of rights? after payment thy start phoning for the next month telling me this is my fault if i paid my account they would never had my account this will teach me to pay my accounts.