Medical Services Group Constantly calling my cell # Very annoying during the day as my cell phone is also used with my job...... other Texas

Phone numbers beginning with 346-241-XXXX cal about three times a day using a different last four dogots everytime. I am blocking them. However, I decided as soon as they come in to my cell phone, I immediately call from another phone with an untraceable # and the call is all of a sudden unavailable for maintenance....that measn the number is on a rotary so no one can call it back. If I wait a day or so and call one of the others, it will identify itself as 'Medical Services Group' if you have a statement or a reference #  to use....????  This sounds like another scam that if you answer your cell phone from one of these numbers, you will be duped, number will be sold to another scam group where you will be harrassed by more numbers.....Good luck.....and Do Not Call Registry as always doesnt mean anything unless you want to file charges at your expense?