Mweb not providing good service.

The little fibre box stopped working, I phoned MWeb and they am now telling me this box belongs to me and want me to pay between 1500 and 1750 call out fee, when I moved houses and I was told I need to leave the boxes at the previous premises as it belongs to Metro Fibre. So now that the new box stopped working I am told that this box belongs to me? And therefor I need to pay this amount. Why am I paying a monthly fee. Can I then have a replacement box as, if what you are saying is the boxes I needed to leave at the old house then as it belonged to me?? Sort out my internet or I am canceling this contract and no I am not paying anything.