customer refuses to pay unless I reinvoice

Hi

in feb 2017 i invoiced a previous tenant who was moving out of our building for some second hand equipment that he had asked if he could purchase from us. I also added a figure of £75 for a weeks use of our Reach Truck that he had helped himself to without permission to help move out. He did not pay any of the invoice and when I chased him he disputed the £75 charge as he said we could not charge him as he had not previously agreed to it. We have had a few weeks where I have tried to reason with him that we could not have agreed it before hand as he didnt ask us if he could use it but I have now had enough. Today I raised a credit note for the £75 and asked him to pay the balance of the invoice. Now he is still refusing to pay the invoice less the £75 unless I give him a new invoice without it showing the £75 charge on it. I don't know if he is just trying to get out of paying any of it. What can I do?