Bad customer service

I have send through a letter from my employer to Ackermans stating that until situation changes we will not get our full salary only uif ters. Ackermans accepted the letter and said that i must let them know when situation changes to make payment arrangements. Im still getting uif im still in the same situation and i did inform Ackermans as well but still they are harassing me everyday from different cellphone numbers asking when am i making payments some of them was even rude over the phone.