Slack customer service and not understanding at all!!!!

I am not getting fed up. I took out a fibre contract with Mitsol/Tech5 in November of 2021 and all was okay until we were forced to move from our property that we were renting from. As we were told to move, we had to make arrangement to get the fibre moved only to be told that it cannot happen and that I will be held liable for a clawback fee which was never explained to me on taking on the contract. When I contacted Tech5 and spoke to a manager, he was kind enough to sort something out for me at a set fee to pay off the clawback fee over 12 months and now, due to me having financial difficulty for 2 months and keeping them informed of same and them changing the figure without notice, handed me over, also without notice. I am not trying to get through to this said manager only for the accounts lady saying to talk to the handover people and I am sorry, I am not going to settle for this. I was given an amount to pay off and you guys now are claiming double of what the initial fee was that was agreed upon and upped the agreed amount as well which was not even discussed with me. I will not pay for the full amount claimed by the agency/collectors. Either someone contacts me or I take this matter futher myself.