exchange, rotate and other methods to use the tires correctly are all fine but its very important to change the tires when the due date is near or when they are used more frequently.
In dubai you can head on naif market, plenty of cheap and good options (both).
In sharjah BMW road, King faisal market and market behind Al falah plaza.
what you will be charged is not the question, you should find a good mechanic who can fix this as its electrical a good electrician who do the job correctly and will not charge you more then 500 aed.