asalam o alikum

I have to ask about a very serious problem pertaining to my fasts.I am a hanafi muslim and want an answer according to that.Now this the problem which refers to one being completely and innocently ignorant.It is a problem regarding to Ramadan fasts and the the missing ramadan fasts which are kept afterwards.Islam has a very humanistic approach and I want a correct answer to the problem as I am confused and worn away.I belong to Pakistan.Since my childhood my parents and their grand parents used to say that you can keep on eating until the Adhan of Fajar,till the last azan.Now in almost every ramadan I and my family used to eat And there are about 450 fasts which i kept like this including the qaza fasts.Now when I am an adult I am so depressed as a mufti sahib told me all your fasts are invalid as you should have concluded your eating at the start of adhan.It is now not humaly possible to keep all those fasts.I have got so low spirited that I have stopped fasting my remaining qaza fats as Allah have not accepted my previous fasts.I have given up!!! Then I turned to awebsite www.islam.qa.com which says that"It is obligatory for the fasting person to refrain from things which break the fast from the true dawn until the sun sets. What is means is when dawn breaks, not the adhaan. Allaah says (interpretation of the meaning):

“and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night)”

I gained hope now another mufti sahib told me that Your fasts are not valid.What should I do now.Is there an alternate or I will have to keep All 450 fasts which I think is a great ordeal and now how can I do it.I mean are you not supposed to be given some compensation or the rule is that strict.
jazakallah khair