Moving home overcharged

Mweb is **** i have been with from February 2022 so I wanted to cancel their services because i was moving from where i was staying, I called them they advised not to cancel because they will charged, so I decided not to but now I am getting an invoice that i have to pay 1700 for what now. I will not pay that money mweb must come and take their staff. Because they must forget that i will pay such a crazy amount