Hi Kulak, if my maths is right you have a 4.6 pole plot which you pay £23 for and it's going up to something over £123? So that from £5.00 per pole to almost £27 per pole?
Can you give a few more details please:
Which site are you on?
What does your tenancy agreement say about rent increases?
What notice have you been given about the increase?
And last but, rather obviously, not least, why such an enormous increase?