Hi GoodOldTommy, thanks for getting in touch with us through the forums.
I apologize if you were received this ban, unfortunately Ubisoft Support staff do not have the ability to lift temporary sanction bans or replace MMR.
If these crashes are happening to you often, are you using any additional software that may have contributed to the crash in the game? If you use any of these programs whilst playing the game would you please disable them in Task Manager before launching the game -
Full Screen Game Overlays - Overwolf / Geforce Experience
VoIP and Chat services - TeamSpeak / Mumble / Discord / Skype / Raptr
RGB controllers - Razer Synapse / SteelSeries Engine / Logitech G Hub / Corsair iCue
Overclocking Software - EVGA Precision X / MSI Afterburner / RivaTuner / ASUS GPU Tweak / ASUS Smart Doctor / Gamer OSD
Hardware monitoring - MSI Kombuster / Fraps
Streaming software - OBS, Xsplit Gamecaster
Peer to Peer soft...
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