Today it is totally useless to buy thousands of backlinks, you must focus on quality and not quantity, anyway, be aware that if you exceed 2000 backlinks in less than 2 months the search engines will automatically Penalize your website.
With regard to websites already penalize, if actually you do or redo an SEO strategy with only quality backlinks you will be easily and quickly re-ranked by the search engines.
Remember that service is the best and cheapest on the web.
Here is the strategy…
Part 1:
All are manually created with Differents IPs