Do I need Visa to Shanghai?

Hi there,
Please Help.
I am a Lithuanian Citizen, will be travelling from London to Bangkok, then Bangkok to Shanghai on 5th July 2016, arriving at 05:20 am, then leaving Shanghai to Taipei on 8th July at 08:20am.

Do I need to obtain an actual Chinese entry permit, as the staying period will be exceeding more than 72 hours ?

I have tried to contact Chinese embassy in London, they insist that 72 hours frame will be exceeded and then I asked about 144 hours policy, they replied to me they do not hold such information about it and can not comment anything on that, apart 72 hour policy.
I am Confused...
Please advice.
Regards
ED