Charged 29,000 for data. - Consumer Complaint for Flow Jamaica

Today I got a bill for almost 14,000 as I requested to change my plan to a lower plan. They left me without a postpaid plan for the day in which a flow rep is said I used 2.9 GB of data and was charged 29,000. The error was on your end and I will not pay until it is removed. They sent me to the store in which I was 63rd person in line and will not be put at an inconvenience because of flow. If this is not resolved without me going to the store, I'm going to report this company.