Stove and Microwave Repair- 5 weeks and waiting-7871

We have tenants in a property that was renovated and Whirlpool appliances were installed. We were told of a fault in the appliances and duly called Whirlpool and e mailed them of the circumstances, we were assisted at that time reasonably quickly and were informed that a technician would be dispatched. Between the 11th of September and the 13th of September the quoted deposit was paid and 'go-ahead' provided. It is now the 12th of October and still absolutely nothing! 4 to 5 different people have promised to get back to us, assist where possible or speak to the technician and still no follow up and no replies. Our tenants remain without a stove or microwave, to add to this stress they also have a very young baby to take care of!