Key won't unlock/lock, won't turn ignition, won't start

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Changed the crankshaft position sensor and when we reconnected the battery and attempted to start the key fob will not turn. Key fob will not lock or unlock the car and will not allow the ignition to turn to position 2. Checked all fuses and relays, changed batteries in fobs and attempted to resynchronize, charged vehicle battery and still nothing. Please help!

How long has your 2007 Mercedes-Benz C280 had this problem?

A few days