Pass of "&" in Retrofit Url dinamica

I need to pass a dynamic url to get the data from a server, for this I am using retrofit but at the moment of passing the url dimanicamente by means of the @Query of Retrofit I am changing the & for its code% 3F the problem is that I do not recognize it and I get an error on the server I have the following code: (I have tried the encoded variants in true false and in passing the & as% 3F but nothing has worked)

The Url I need is something like this: link the one that returns the method is the same only in & puts% 3F my code is this:

 @GET(value = "torneo/tablaClasificacion/")

  Call < RespuestaGenerica > getTabla(@Query(value = "torneoDetalleId", 
encoded = true) String torneoDetalleId); 

the call I do it like this:

retrofit2.Call<RespuestaGenerica> call = A 
piAdapterRetro.getApiService().getTabla("26&callback");