Rude waitress

i Usually start my Saturdays at with breakfast and coffee decided to go to mugg and bean as I did the previous week, I wouldn’t get a suitable table so I opted the one offered, I needed to charge my phone there had to be seated along the plug points, as soon as I saw a table being cleared I asked the waitress “Georgina” who was clearing the table that I would like to be moved to that table once she’s done she agreed. I then waited for for I turned to check if she was done I saw a “reserved” sign on the table I figured she’s not done once she’s done she will give me a heads up, the next thing I saw someone sitting there I called her twice to find out that’s going on she decided to ignore me blatantly I can’t believe how rude and unbothered she was, decided to leave the restaurant as I feel I don’t have to tolerate such treatment