No Courier Pick Up for a Refund

I bought the most ********** carpets (2) on the 4th of June , which happened to be on Sale. Upon receiving them, i realised how of a bad quality they are, so i requested a refund..I was given a choice to either arrange a courier service to come collect them or they can arrange the same courier they use to pick them up..Upon calling to confirm how the pick up works, i was discouraged (which made sense at the time) to arrange my courier service, but was advised one will be arranged for me..3weeks later i have received service from Leroy Merlin, instead when i call i am told ,the “service provider from MarketPlace” hasn't been able to arrange a courier for me..What frustrates me the most is the fact that i have to call to follow, them miraculously received an automated email stating the same thing”we are contacting the service provider”.I am promised someone will be in contact with me, which they never do ..I spend my money when calling Leroy Merlin and waste my time in the process..I am beyond livid because i need my money back for those carpets.