Here is the complete list of phone numbers that AmeriCredit uses.
You can use it to block all of their numbers:

705-876-1163
705-876-3999
705-876-5321
705-876-5322
705-876-5323
705-876-5324
705-876-5325
705-876-5326
705-876-5327
705-876-5328
705-876-5329
705-876-5330
705-876-5331
705-876-5332
705-876-5333

Caller Type: Spam