pathetic service

This Morning i receive a call from one of the Agent at cell c regarding my contract -i don't knw where to start cause now im hurting regarding the pathetic low service level and rudeness that i got from that guy .he also have the gusts to tell me that i dnt knw what im taking about hence they will keep on billing the way they want as per that Guy Agent .my question that i asked that guy after telling me that my contract amount of R680 and i asked him how many contarct does it show there ,he said 3 and i told him that the data and laptop it was cancelled cause i no longer have nor use those service i am only left with Nova 8 i which i upgraded early this year ..that guy continued interrupted me not giving me a chance to speak and also swearing at me ...if cellc is how you do business with people you will end up loosing more client and ull be ne liquidated for being broke .