The last time we updated their Facebook ads budgets for them was in February 6th. 
That was $1,000 for Emsculpt. 
On June, their budgets were updated again. Nothing for Facebook.
In fact, there hasn't been anything for Facebook that we ran since Emsculpt back in February. 
There is no budgets for them for FB for Coolsculpting or anything else (other than Emsculpt). 
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It appears the account may have violated these TOS - 

 Ads must not promote products, services, schemes or offers using deceptive or misleading practices, including those meant to scam people out of money or personal information. 

 Examples 

 |  Ads that link to websites that offer free trials for new customers that sign up for a service 
 |  Ads that link directly to official visa websites or websites that inform users about visa requirements without promising any outcome 
 |  Ads promoting background checks that claim to sell access to personal information 
 |  Ads that promote products or services that claim to boost Facebook or Instagram likes or followers 
 |  Ads that promote schemes or services that claim to guarantee a visa without any requirements 
 |  Ads that feature a picture of a public figure to mislead users into buying a scam product 

We're not running FB for this client. 

Shane, I kind of figured that. 
But we are still trying to find out what happened.. Why their account got suspended or disabled?

It would be something the client did. Repeated violation of Facebook ads policies.