Hello, I have an audi 2013 A4 that won't start, no lights on, MMI Works

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but won't turn on, No way to get car out of park to tow. Prior to problem car was at a panel shop for some cosmetics repairs and the battery needed to be often take out. Now the car won't start and prior to this the car starts, the car hasn't being driven for a month while at the panel beater shops but all along it starts even at the panel shop till recently , often says Ignition Lock defective. I was told the car could have loose it memory. How possible is that and how i get it to get back to his senses.