Incorrect information and bad customer service

i called Cell C mid Jan to enquire how much i neededto pay to recon and be covered till the Feb d/o. i was advised to pay R417.81 and requested my d/o to change to the 25th of every month.i was assuisred this was done. Mid Feb i got suspended and received an sms with an overdue balance. today i called it to find that firstly my d/o was not changed and that the information i was given was incorrect. Rosemary only gave me the amount to reconnect not to cover me until the Feb d/o and Mahommed who was supposed to escalate my query ignored me hen i told him my lunch time was over and he was supposed to give me a ref number and he was rude and not willing to answer my questions.i am very unhappy about the level of service from cell c.when i request statements i never get any response,when i call using my number i never get through. i want someone to resolve this i will not the penalty for the unpaid d/o as i was given an amount to pay and my d/o was supposed to be chnaged to the 25th and wasnt.someone call me back to resolve.the service is awful