Poor customer service and misleading

I am a Vodacom contract user for more than5 years,I’m currently a student and usually pay my account between the 3rd and 4th of every month,however I called in on the 4th of January for a payment arrangement,an agent who assisted rep**** by saying I could pay on the 5th of January since it’s not going to be on the 15th of January,I automatically received an sms that my line has been locked which I did call in prior...I have have the worst experience as I was transferred from department to department with any solution...I have been a very loyal customer for years and very disappointed with the level of service I have received,I totally feel misled with incorrect information and an amount that will be added to my bill hence I did take the initiative to call and make payment arrangements,how come a large service provider does not use a system where each department can via what was was logged by a previous consultant...I expect clarity and compensation with such behavior and I will not pay for any charges that will occur....Regards N Nqadu