Installation fee lies

I rated vox 4 stars becouse they have given me such a good customer service without any complications and the is a but. I signed with them a month to month for their fibre deal at home. A sales agent came to my place during their promotion in December and I took the deal on the spot coz it was a good deal and becouse I don't work this deal realy worked for and of course I told the agent that I dont work and that I might be moving out of the place I'm staying in six to seven months from then and he explained that I need to be with them for at least six months so I don't have to pay for the installation fee and that was perfect for me in any case for me I don't want to cancel my contract with vox it's just that I'm moving next month November and I want to carry on with them but they told me no then I'll have to cancel and pay about R2000 for the installation fee and that I need to be with them for 12 months not six and the reason why I took this from the first was becouse it worked in my favour and I have refferd so many people to vox explaining how good they are and they but now I'm very disappointed with them can't they just let me move with them coz now what's the use of continuing with them if they are going to make me pay for the free installation if I still want to use their product I might as well just go to another provider. People that should pay are people who are canceling canceling with them not people that still want to continue with them and I've never ever missed a payment with them never. And it's not even my fault this is happening the person who came to sell me the product **** to me twice.