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So they hooked up your 30 amp 120 VAC cord to a 220 VAC outlet? Start by getting a small digital multimeter and we can take some reading and track down the damage. It might be confined to just the converter. I need to know the make and model of your load center when you respond.
Hopefully, you got this resolved as I didn't hear back from you. You can always return to this posting again if you Bookmark it and we can do a follow up. All part of our service and please take time to enter a rating as that is the only way I get credit for my time spent helping you. Thanks! Be safe........