PR Renewal takes around 70 working days and that is the wait time frame only. As soon as you get AOR for PR Renewal, you get your PR renewed and sent to you in a week. Best part is that they keep on updating the processing date (for example, "now processing application received on...") so you know when to expect your application to be processed.
I also had to renew my PR Card looking at the time it is going to get Citizenship. I chose to renew it because I travel to US every 3 months and don't want to be in a situation where I have to travel and don't have PR Card. Always good to have a backup.
There is no point in getting frustrated over anything. It affects you, not them ! Calling them is not going to expedite your case, in my humble opinion.