Bad service

i have purchased a prepaid month to month data for an year on 24th of November 2015, i did call the customer care asked for change of date to 1st of every month, as they told they couldn't and later on i am receiving data on 24th 23rd and now by 21st, as it is not consistent and how can they change the dates when they cant change to 1st of every month. called the customer care again saying that i have received on a different date they don't want to agree that i have received it earlier, arguing that i have received the data only today. very bad service.unhappy