If you don't have their number, there are other ways: Facebook, email, twitter, etc.
That said, there is not a spell to make someone call you. Nor would it work if there was one. You shouldn't need a spell for what you can accomplish through other means; you can get them to call you by talking to them in other ways. Surely if you want them to call you, you must have communicated with them in some fashion before. Otherwise how would they have your number, hmm?
As for not being on speaking terms with them, there are ways around that as well. Surely you can send a message apologizing (it does not matter if you think you have done nothing wrong, if you are not on speaking terms, both of you had a part in it) and tell them that you wish to talk it over. If they ignore that message or are unwilling to talk, give them time. There was obviously some offense taken, or else you would be on speaking terms. Time heals, and they may just need some time.