HC
I'm glad you've clarified that you know what service you're supposed to get (only you seemed unsure earlier).
Thanks also for adding clarity to your incident. If the situation was as simplistic as you have stated then no I don't think you received a good service.
Given your information I can't think why ATC prescribed you a specific altitude instead of "not above". That would've allowed both of you to adjust altitude as req'd to avoid each other. As for your routing did you request a threshold crossing? Was there departing traffic? Etc, etc. I.e. Did ATC give you the routing you requested? And the same with the other flight? Did you request traffic avoidance? - Simply requesting higher may not have alerted the controller to the fact that you were unhappy with the situation.
Those are just a few of the questions that popped into my head, not knowing local geography, runway alignments, etc, etc.
Did you consider calling the unit involved?