Travels on the trains at times

It was eventful returning home on the train. First I just miss the tube, the next one was cancelled so I was waiting around. Then some trains to Brighton were cancelled (fastest route home) so I get on the amended train getting off at East Croydon to catch a connection to Crawley. Normally I arrive on platform 3 and departure on 3, very easy but not today. I arrive on platform 3 then get told to go to platform 2 to then be told while the train was pulling into the station to go back to platform 3. Plus the fact you can't even hear the announcements clearly when trains are pulling in and out of the station.