You win. I give up. I won't fight anymore.
There is no point. I have a life, and my life is worth more than £50. You can have that £50 you earned dishonestly, but you could have had so much more if you worked to make this right from the beginning.
I could have given you more than just £50 but because you wanted the money the quick and dishonest way, I will be leaving you in November.
We could have a long term relationship where you will eventually earn thousands of pounds from me. But you really wanted that £50, and that £50 will cost you. Have it, I shan't fight you any more.
Unless you bill me of things I did not agree of again, this will be the last of it. The next time you will hear from me will be in October when I give my one month notice to be freed of your tyranny.
Good luck, you will need it.