As a piece of advice, it is always best to ask to talk with the Supervisor in the first instance. The controller involved will not have an unbiased opinion and, depending on what they percieved to have happened, might be a bit prickly since not all ATCOs have attended diplomacy school yet
The supervisor should already have heard the ATCOs side of the story, he will know the various rules and procedures which are pertinent, and he can then listen to your side of the story and hopefully come to a balanced judgement. He will also be aware of the various follow up actions which can be taken depending upon how he feels the 'incident' needs to be closed.
And in spite of what the ATCO told you, tapes can be pulled for a 'look see' without any reporting action ever being taken. The only constraint will be that some units don't have the ability to instantly replay them in cases like this and will have to wait till the data tape is changed on the recorder, which could be up to 24 hours away. Some bigger units have instant digital data replay available (OK, by instant I mean once the engineers have set it up .. so probably 30 mins in reality for a non urgent replay). It's always worth asking them to have a look in cases such as yours, particularly if you have been 'reamed' by ATC about it.
Hopefully TC-LTN can find out exactly what the radar picture showed, and if there is big discrepency between your reported track and that shown on the radar, then I am sure the radar mapping and track correlation can be checked for accuracy and a definitive answer on the 'infringement' given.