Please Help! How do I retrieve recieved calls from...

Question

Hello.
I have recently carried out a six month long project for a client company.
The client has been very underhanded and basically 'stolen' my work, and are trying to claim that they managed to do the work themselves.
It looks like am going to have to take them to court. They are a big company, and I am a self employed consultant. 
I have to list the phone calls that were made to me, [on my N95] So I can prove the dates when they called me.
But when I go into the recieved calls list, only the last few calls are listed.
Im assuming this is because the 'factory settings' are set so that the phone, so that when it comes out of the box it does not save all the calls.
But I have never deleted anything manually.
I am hoping that, [like a PC] this list of recieved calls, is in fact still stored somewhere inside my phone. 
Can anyone help? 
Is there anyway I can retrieve the recieved calls list?
What are my options here? Is there a specific data recovery package that would work?
Are the list of recieved calls still inside my phone somewhere?
Any help would be greatly appreciated.
Thankyou.
I tried contacting Nokia on the phone, and basically got brushed off. [After an hour on the phone I could not even get the nokia tech support number for the UK. They assured me I would get an email, but none arived]
 [My itemised bill only lists outgoing calls. And I have contacted my service provider who cannot provide me with this information, as it would be a breach of the data protection act]

Answer 1

the only way is by your log and depending how long its been set at
here is the online guide for the asistance to it
http://nds1.nokia.com/phones/files/guides/Nokia_N95-1_UG_en.pdf
 LogTo monitor the phone numbers of missed, received, and
dialed voice calls, press , and select Applications >Log > Recent calls. The device registers missed andreceived calls only if the network supports these
functions, the device is switched on, and within the
network service area.To clear all recent call lists, select Options > Clear recentcalls in the recent calls main view. To clear one of the call
registers, open the register you want to erase, and selectOptions > Clear list. To clear an individual event, open aregister, scroll to the event, and press .Call durationTo monitor the approximate duration of your incoming and
outgoing calls, press , and select Applications >Log > Call duration.Note: The actual time invoiced for calls by yourservice provider may vary, depending on network
features, rounding off for billing, and so forth.To clear call duration timers, select Options > Cleartimers. For this you need the lock code. See ‘Phone and
SIM card’, p. 116.Packet dataTo check the amount of data sent and received during
packet data connections, press , and selectApplications > Log > Packet data. For example, you maybe charged for your packet data connections by the
amount of data sent and received 
If  i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520