Nestaway Technologies — agreement/maintenance amount /rent increment

I am the owner of a flat on accurate wind chimes. We have given the flat to nest away with a agreement of i will receive 25k rent even if the house is vacant. For a year they paid me the rent but not maintenance. After a year when they had to renew the agreement and increase the rent as per previous agreement they denied increasing rent. And they said that the same agreement cannot be given. Apart from this they said that they have paid one year maintenance amount to the association (Without taking my consent). I have already paid the same amount to them from my end. When i contacted the association they said that nestaway never paid them. It's been 6 months now i have been asking nest away to help me with a receipt of the amount paid to accurate and i have not received anything. They have stopped paying me rent and there is no agreement that was renewed. I am bearing heavy loss specially during this covid situation. Please help me with this. My number is [protected]