I just want to express my concerns about my...

If your inquiry is about the telecommunications company’s demand on you to pay immediately the 1500 AED and you have requested them to delay the payment til you get your monthly salary, in that case, we recommend you to contact the customer service department in the telecom company again and explain to them your financial status and your inability to pay the required amount at the current time only after receiving your salary.
Finally, you must negotiate with the telecommunications company until you obtain their consent on your request for payment upon getting your monthly salary