internet slow

im a new customer @Jenny ...joined a week ago...first 5 days were great, it would go up to the 4meg i was paying for untill it started dropping two days ago to 1 meg or less...called their support and they say they had fixed it but nada.....so yah it hasnt been even a month and im alredy in doubt....just sad...now im thinking of going back to my previous provider...just sad