This is my first question on the Law Stack Exchange so hopefully this is the right place for it. To play out the scenario this is what's happened..
I used to work for a company that need the odd job doing here and there and I agreed when I left that I would still help out where I can.
They contact me every now and again with some jobs, I tell them a quote and they pass this into the client and i get some work to do.
This one situation, a year ago I got told a very brief overview of what needs doing, I did exactly what needed doing. Now a year on, I have got a message saying that it doesnt work as he expected and he actually needs something else adding to it, which wasn't in the initial brief.
The job itself was when someone views a web page, it emails the person who owns that page to let them know that the page was viewed. I did it exactly as described.
Now he is saying that it's sending too many emails being sent per day and I need to limit it, however a limit was never specified previously nor was it ever mentioned in the exchange when discussing the job. Also as I am a professional to get this to work as requested I would have to store some kind of unique identifier and there is no GDPR in place for this site.
This is another couple of hours work for me, so I told him that I cannot do it for free as it's an additional requirement and it would take a good few hours to complete.
His response to that, a year on is he paid me for a job which was signed off. I know this because he refused to pay me before. If I don't do the additional requirements for free then I need to give the money back, or I should be expecting some letters.
Unfortunately, as this was an old boss I didn't ever foresee this happening so we never actually had a contract in place and I've since had a new phone so all of the communication has been removed.
I'm just wondering where I stand with this and do i have to pay him back or do the work for free or do I have a strong case if things do get serious?