Why mostly service provider not telling us the hidden things about a conncetion.

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Hey friends today i have faced some problems related to my Internet connections.. I have an Airtel broadband unlimited connections.. i use their internet service during 2 years.. and when i got it.. then they tell me it is 64KBPS with unlimited downloading connections.. and the downloading speed was only 8-10KBPS.. And after 1 year i find one day that my connections gains a huge downloading speed of up to 250kbps.. but my internet connection plan was only of 64KBPS.. so i was very happy.. that i get good downloading speed.. but this speed was only for 1 days.. during to any critical problems.. And after one week i again feel that now i get speed of downloading up to 50-90KBPS.. and this situations still continue yesterday's night.. and many time i have get calls from their customer care.. for upgrading my plan.. but i refused their offer.. because they offer me 512KBPS plans with the 100 rupees of monthly additional charges and total charges was 660 per month.. so i think.. i am satisfied with my current plan.. so i reject their plan.. and after this.. they again calls me 3-4 times.. but i reject again.. but when i saw.. i am still get downloading speed of 50-90KBPS then i was in some doubt..that Airtel could change my plans.. and if they do this.. then i should pay additional charges.. so i was worry.. and one day i called to customer care for getting information about my connections.. as i doubtful.. and this doubt was right.. they told me that my plan has been upgrade from 64KBPS to 512KBPS..without any additional charges.. then i feel very happy.. that i shouldn't pay any additional charges.. and i can enjoy higher speed plan in same charges.. and till yesterday's night i had facing no any problems related to downloading speed.. but today when i starts my computer in the morning. then i find.. that downloading speed is very very poor.. and it is only 8-10KBPS.. then i contact to customer care.. and they told me.. that my connection was 512KBPS with 5GB of downloading every months.. and this months i have crossed the limit of 5GB downloading.. so now speed is automatically going down to according 64KBPS plans.. yes this hidden truth i have know today.. so now i am waiting for 17th date because from 17th my billing periods are end.. and i will again get speed of 512KBPS..so what you say.. have you ever faced this problems..