I haven't heard of (or it called) a 'disconnection' fee, but 'exit' fees are common. There's no pretence with that that there's work to do in terminating your contract, it's just, oh, you signed up for 24m, you want to leave in month 18, ok no problem but we'll sting you for £X because the alternative is probably you have actually technically committed legally to 24 months so in a way although it doesn't feel like it we're doing you a favour. ... It's pretty shit I think for tenants in particular where the available service periods don't necessarily line up with the time they actually spend in the property.