Still paying a migration penalty

I've made a previous post regarding being charged a migration penalty when moving from a 10 + 10gig contract to a 50gig home office LTE. I was told that i'm being charged the penalty due to an additional device, and that the last penalty would be March 2016. I received an invoice for April and it still shows a migration penalty being charged.<br> <br> I would like a response regarding this.