It's probably not that did you lisence transfer or something. This would be abusing Promotions

Hub wrote Buying with msp, whether it's from scotia bank or not, is not market place theft.
Market place theft would be getting the game or dlc for free using another account.

Even though you think your getting it for free by using scotia bank, your actually not.
Scotia bank paid Microsoft to advertise themself on the dashboard, and as part of the agreement Microsoft gave them msp codes to advertise with.

Although the scotia bank ad, could be considered as system abuse if you created multiple accounts, it is highly unlikely you got banned for it. Besides it was so long ago and this was probably the reason they stopped.

Try posting on the xbox support forums to get a more specific reason, than 'market place theft'.

Here is quoted text from the e-mail my Main Account received. My latest purchases from Marketplace were mainly bought with 100 ($1.50) point codes. In total I redeemed less than 50 on the same account. Account now has permanent Suspension and CONSOLE IS BANNED!

This email is to notify you that your Xbox LIVE account privileges have been permanently suspended due to marketplace theft.

.....

The conduct that caused this suspension may include, but is not limited to:

Duplication of item purchase history
Attempted Microsoft Points fraud
Illegitimate acquisition of redemption codes

....

I gave quite a few away --- MADE NO monetary PROFIT.

Weird I got suspended for that a long time ago... 2 week ban.