Hi,[br]
It may already be too late for the phone to be saved, but you can only try.
As you know water and electronics and electricity are not a good mix.
''The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the phone's operating design and could damage the components.''
'''''Rice does not fix the problem, especially problems caused by corrosion'''''
[https://www.ifixit.com/News/30047/rice-is-for-dinner-not-repair|Rice is for dinner, not repair]
''First '''do not turn on your phone''' and then you need to '''remove the battery as soon as possible''' from the phone'' to minimize any further damage.
Then you need to dis-assemble the rest of the phone and clean ''all the affected parts'' using '''Isopropyl Alcohol 99%+''' (available at electronics parts stores) to remove all traces of corrosion etc. Do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do check the label to verify the amount of IPA. The higher the percentage the better.
Here is a link that describes the process.
[[Electronics Water Damage]]
As always with electronics, especially surface mounted PCBs be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board.
Hopefully after you have done all this the phone ''might'' possibly work correctly again.
You may have to replace the battery as it may have become depleted beyond recovery.
You do not state the model number of your Vodafone phone, so you may have to search places such as YouTube to find teardown videos that will help you to open the phone so that it can be inspected and cleaned properly
If this process seems too daunting, take your phone to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, ''do it sooner than later''.