BOODING BALANCE RR
This can not be done with 802.3ad-balance-rr. 802.3ad always assumes all participating interfaces/ports are of equal size.
Your problem could be solved with nth load balancing:
https://help.mikrotik.com/docs/display/ROS/Firewall+Marking#FirewallMarking-Example4:(NTH)
Use that and Mangle to mark connections and assign them to routes/interfaces.
Let me explain myself properly; I have an XXX capacity with my suppliers but how can a single connection not support it 2 antenna to transport it to my office. After my supplier’s router I put another mikrotik router in which I do my booding for with 2 separate connections which in turn route to my office; at my office I receive the 2 link in another mikrotik router in which I do another reception booding.