I suppose they upgraded BECAUSE you cancelled.Last week i put in a cancellation request for my dsl service which is 25/25. So yesterday i got an email from my ISP stating that they upgraded my download to 300 mbit at no additional cost, just because this service was available in my area. This is 2 days before the service gets terminated! and Ive had this service for over 8 months.
I found out my current main provider here (Telekom) is an odd one. I was with Digi before and they said 1 GB but had 650mbps+ something, so I figured when they will get me the 100 mbps i will get 50 at most. I took it for an extra project because my aunt living next door wanted the telekom TV stations and the 100 mbps came free, more or less, but I found out it is actually 200 and when I asked if they can do more than 200 they said no, yet when I cancelled Digi and upgraded to 200 I actually have seriously over 500, close to what i was doing with Digi before... It is the first provider which actually delivers significantly more than advertised.