M A.

So I asked for a piece of work about data visualisation to be done within 24 hours. It was not a complicated ask by any means and was assured they could do it. We agreed a price of £100 and I gave as much detail as possible and even gave a picture of what I would like the outcome to look like. Some issues arose:
Firstly, they tried to get me to give them google api which was not needed for the task and claimed that this meant they needed an extra day 5 hours before the deadline.
Secondly, despite asking multiple times initially if they understood the brief and the example outcome picture, they had many questions just a few hours before the deadline and after which made me think they would not be able to deliver on time.
Thirdly, the agreed deadline was 2pm GMT. They sent an output at 3pm GMT which is not too late, however it did not fulfil the specification that we had agreed on. There was no title, labels or a legend (even though those were in the agreed brief and example picture) and the whole thing was not complete until 9pm GMT that night. Even what they gave at 9pm was not technically fulfilling the brief as it was unreadable which is disappointing but I just had to accept because they stopped replying to my emails.
Fourthly, They also did not make it clear that you only get the r code after the second payment however there's no guarantee that it's an r code that works because when I tried to run what they had given, it was full of errors. When I contacted them about this I was told "you have to run complete code to get all the things
You cannot run just ine line to get the plot
Run from start to end"
I had been running the whole thing and when I asked for further help they did not respond.

Overall I think this company is okay; just use Paypal to pay them (not a bank transfer as it's not immediate), give them lots of time and be prepared for either a result that is not exactly what you wanted on time.

Tl; dr an okay company, delivers late and not fully to specification that was agreed. Don't ask them for last minute work or anything too complex.