Unprofessional sms's received from Ackermans

I am very disappointed in the after sales service of Ackermans as the amount owing always goes up by R400 every month even though I am not using the account. When the consultants call me and I answer the call they never speak and the calls get dropped. Another issue that I have is that with all the ******** going on in this world they send me sms's using unprofessional jargon eg. They will say "u" instead of "you". They now claim that I owe them over R2000 even though the sms stated R1300and when I asked the consultant to explain she simply couldn't. If you want me to take you seriously then consider being professional.