Virgin Active does not keep their promises

I signed contract on the 27th November 2015 in Houghton by Henry whom I told that I did want a contract with Virgin Active but wanted to take it in January because of the commitments I had in December and He convinced me to sign it in November because the prices are going up in January and He said I must try and pay that R345 in December and They wont charge me for the month of January ....now I just received a call from your offices and when I tell them what he said they were surprised and they said I must call him ,I just called him and he is now denying saying it and I was also not told about all the fees that I was just told I'm owing (transfer fees etc.)